diff --git a/core/Makefile b/core/Makefile
index 82fe341..64fbe22 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -1314,6 +1314,7 @@
 # $(5) - Directory to use.  Notice files are all $(5)/src.  Other
 #		 directories in there will be used for scratch
 # $(6) - Dependencies for the output files
+# $(7) - Directories to exclude
 #
 # The algorithm here is that we go collect a hash for each of the notice
 # files and write the names of the files that match that hash.  Then
@@ -1331,7 +1332,7 @@
 $(2) $(3): PRIVATE_DIR := $(5)
 $(2) : $(3)
 $(3) : $(6) $(BUILD_SYSTEM)/Makefile build/make/tools/generate-notice-files.py
-	build/make/tools/generate-notice-files.py --text-output $(2) \
+	build/make/tools/generate-notice-files.py --text-output $(2) $(foreach xdir, $(7), -e $(xdir) )\
 	    $(if $(filter $(1),xml_excluded_vendor_product_odm),-e vendor -e product -e system_ext -e odm --xml-output, \
 	      $(if $(filter $(1),xml_excluded_system_product_odm),-e system -e product -e system_ext -e odm --xml-output, \
 	        $(if $(filter $(1),xml_product),-i product --xml-output, \
@@ -1356,6 +1357,11 @@
 winpthreads_notice_file := $(TARGET_OUT_NOTICE_FILES)/src/winpthreads.txt
 pdk_fusion_notice_files := $(filter $(TARGET_OUT_NOTICE_FILES)/%, $(ALL_PDK_FUSION_FILES))
 
+# Some targets get included under $(PRODUCT_OUT) for debug symbols or other
+# reasons--not to be flashed onto any device. Targets under these directories
+# need no associated notice file on the device UI.
+exclude_target_dirs := apex
+
 # TODO(b/69865032): Make PRODUCT_NOTICE_SPLIT the default behavior.
 ifneq ($(PRODUCT_NOTICE_SPLIT),true)
 target_notice_file_html := $(TARGET_OUT_INTERMEDIATES)/NOTICE.html
@@ -1366,7 +1372,8 @@
 	        $(target_notice_file_html), \
 	        "Notices for files contained in the filesystem images in this directory:", \
 	        $(TARGET_OUT_NOTICE_FILES), \
-	        $(ALL_DEFAULT_INSTALLED_MODULES) $(kernel_notice_file) $(pdk_fusion_notice_files)))
+	        $(ALL_DEFAULT_INSTALLED_MODULES) $(kernel_notice_file) $(pdk_fusion_notice_files), \
+	        $(exclude_target_dirs)))
 $(target_notice_file_html_gz): $(target_notice_file_html) | $(MINIGZIP)
 	$(hide) $(MINIGZIP) -9 < $< > $@
 $(installed_notice_html_or_xml_gz): $(target_notice_file_html_gz)
@@ -1400,10 +1407,13 @@
 # being built. A notice xml file must depend on all modules that could potentially
 # install a license file relevant to it.
 license_modules := $(ALL_DEFAULT_INSTALLED_MODULES) $(kernel_notice_file) $(pdk_fusion_notice_files)
+# Only files copied to a system image need system image notices.
+license_modules := $(filter $(PRODUCT_OUT)/%,$(license_modules))
 # Phonys/fakes don't have notice files (though their deps might)
 license_modules := $(filter-out $(TARGET_OUT_FAKE)/%,$(license_modules))
 # testcases are not relevant to the system image.
 license_modules := $(filter-out $(TARGET_OUT_TESTCASES)/%,$(license_modules))
+# filesystem images: system, vendor, product, system_ext, and odm
 license_modules_system := $(filter $(TARGET_OUT)/%,$(license_modules))
 license_modules_vendor := $(filter $(TARGET_OUT_VENDOR)/%,$(license_modules))
 license_modules_product := $(filter $(TARGET_OUT_PRODUCT)/%,$(license_modules))
@@ -1414,16 +1424,44 @@
                        $(license_modules_product) \
                        $(license_modules_system_ext) \
                        $(license_modules_odm)
+# targets used for debug symbols only and do not get copied to the device
+license_modules_symbols_only := $(filter $(PRODUCT_OUT)/apex/%,$(license_modules))
+
 license_modules_rest := $(filter-out $(license_modules_agg),$(license_modules))
+license_modules_rest := $(filter-out $(license_modules_symbols_only),$(license_modules_rest))
+
+# Identify the other targets we expect to have notices for:
+# targets copied to the device but are not readable by the UI (e.g. must boot
+# into a different partition to read or don't have an associated /etc
+# directory) must have their notices built somewhere readable.
+license_modules_rehomed := $(filter-out $(PRODUCT_OUT)/%/%,$(license_modules_rest))  # files in root have no /etc
+license_modules_rehomed += $(filter $(PRODUCT_OUT)/recovery/%,$(license_modules_rest))
+license_modules_rehomed += $(filter $(PRODUCT_OUT)/root/%,$(license_modules_rest))
+license_modules_rehomed += $(filter $(PRODUCT_OUT)/data/%,$(license_modules_rest))
+license_modules_rehomed += $(filter $(PRODUCT_OUT)/ramdisk/%,$(license_modules_rest))
+license_modules_rehomed += $(filter $(PRODUCT_OUT)/debug_ramdisk/%,$(license_modules_rest))
+license_modules_rehomed += $(filter $(PRODUCT_OUT)/vendor-ramdisk/%,$(license_modules_rest))
+license_modules_rehomed += $(filter $(PRODUCT_OUT)/persist/%,$(license_modules_rest))
+license_modules_rehomed += $(filter $(PRODUCT_OUT)/persist.img,$(license_modules_rest))
+license_modules_rehomed += $(filter $(PRODUCT_OUT)/system_other/%,$(license_modules_rest))
+license_modules_rehomed += $(filter $(PRODUCT_OUT)/kernel%,$(license_modules_rest))
+license_modules_rehomed += $(filter $(PRODUCT_OUT)/%.img,$(license_modules_rest))
+license_modules_rehomed += $(filter $(PRODUCT_OUT)/%.bin,$(license_modules_rest))
+
+# after removing targets in system images, targets reported in system images, and
+# targets used for debug symbols that do not need notices, nothing must remain.
+license_modules_rest := $(filter-out $(license_modules_rehomed),$(license_modules_rest))
+$(call maybe-print-list-and-error, $(license_modules_rest), \
+        "Targets added under $(PRODUCT_OUT)/ unaccounted for notice handling.")
 
 # If we are building in a configuration that includes a prebuilt vendor.img, we can't
 # update its notice file, so include those notices in the system partition instead
 ifdef BOARD_PREBUILT_VENDORIMAGE
-license_modules_system += $(license_modules_rest)
+license_modules_system += $(license_modules_rehomed)
 system_xml_directories := xml_excluded_vendor_product_odm
 system_notice_file_message := "Notices for files contained in all filesystem images except vendor/system_ext/product/odm in this directory:"
 else
-license_modules_vendor += $(license_modules_rest)
+license_modules_vendor += $(license_modules_rehomed)
 system_xml_directories := xml_system
 system_notice_file_message := "Notices for files contained in the system filesystem image in this directory:"
 endif
@@ -1433,31 +1471,36 @@
 	        $(target_notice_file_xml), \
 	        $(system_notice_file_message), \
 	        $(TARGET_OUT_NOTICE_FILES), \
-	        $(license_modules_system)))
+	        $(license_modules_system), \
+	        $(exclude_target_dirs)))
 $(eval $(call combine-notice-files, xml_excluded_system_product_odm, \
 	        $(target_vendor_notice_file_txt), \
 	        $(target_vendor_notice_file_xml), \
 	        "Notices for files contained in all filesystem images except system/system_ext/product/odm in this directory:", \
 	        $(TARGET_OUT_NOTICE_FILES), \
-	        $(license_modules_vendor)))
+	        $(license_modules_vendor), \
+	        $(exclude_target_dirs)))
 $(eval $(call combine-notice-files, xml_product, \
 	        $(target_product_notice_file_txt), \
 	        $(target_product_notice_file_xml), \
 	        "Notices for files contained in the product filesystem image in this directory:", \
 	        $(TARGET_OUT_NOTICE_FILES), \
-	        $(license_modules_product)))
+	        $(license_modules_product), \
+	        $(exclude_target_dirs)))
 $(eval $(call combine-notice-files, xml_system_ext, \
 	        $(target_system_ext_notice_file_txt), \
 	        $(target_system_ext_notice_file_xml), \
 	        "Notices for files contained in the system_ext filesystem image in this directory:", \
 	        $(TARGET_OUT_NOTICE_FILES), \
-	        $(license_modules_system_ext)))
+	        $(license_modules_system_ext), \
+	        $(exclude_target_dirs)))
 $(eval $(call combine-notice-files, xml_odm, \
 	        $(target_odm_notice_file_txt), \
 	        $(target_odm_notice_file_xml), \
 	        "Notices for files contained in the odm filesystem image in this directory:", \
 	        $(TARGET_OUT_NOTICE_FILES), \
-	        $(license_modules_odm)))
+	        $(license_modules_odm), \
+	        $(exclude_target_dirs)))
 
 $(target_notice_file_xml_gz): $(target_notice_file_xml) | $(MINIGZIP)
 	$(hide) $(MINIGZIP) -9 < $< > $@
@@ -1495,7 +1538,8 @@
 	        "Notices for files contained in the tools directory:", \
 	        $(HOST_OUT_NOTICE_FILES), \
 	        $(ALL_DEFAULT_INSTALLED_MODULES) \
-	        $(winpthreads_notice_file)))
+	        $(winpthreads_notice_file), \
+	        $(exclude_target_dirs)))
 
 endif  # TARGET_BUILD_APPS
 
diff --git a/core/notice_files.mk b/core/notice_files.mk
index 9df1c11..77fb8d4 100644
--- a/core/notice_files.mk
+++ b/core/notice_files.mk
@@ -6,7 +6,7 @@
 ifneq ($(LOCAL_NOTICE_FILE),)
 notice_file:=$(strip $(LOCAL_NOTICE_FILE))
 else
-notice_file:=$(strip $(wildcard $(LOCAL_PATH)/NOTICE))
+notice_file:=$(strip $(wildcard $(LOCAL_PATH)/LICENSE $(LOCAL_PATH)/LICENCE $(LOCAL_PATH)/NOTICE))
 endif
 
 ifeq ($(LOCAL_MODULE_CLASS),GYP)
@@ -101,7 +101,7 @@
 $(installed_notice_file): $(notice_file)
 	@echo Notice file: $< -- $@
 	$(hide) mkdir -p $(dir $@)
-	$(hide) cat $< > $@
+	$(hide) awk 'FNR==1 && NR > 1 {print "\n"} {print}' $^ > $@
 
 ifdef LOCAL_INSTALLED_MODULE
 # Make LOCAL_INSTALLED_MODULE depend on NOTICE files if they exist
diff --git a/core/soong_cc_prebuilt.mk b/core/soong_cc_prebuilt.mk
index 190a7ed..7853890 100644
--- a/core/soong_cc_prebuilt.mk
+++ b/core/soong_cc_prebuilt.mk
@@ -128,10 +128,11 @@
   $(same_vndk_variants_stamp): PRIVATE_TOOLS_PREFIX := $($(LOCAL_2ND_ARCH_VAR_PREFIX)$(my_prefix)TOOLS_PREFIX)
 
   $(same_vndk_variants_stamp): $(my_core_shared_lib) $(LOCAL_PREBUILT_MODULE_FILE)
-		$(call verify-vndk-libs-identical,\
-		    $(PRIVATE_CORE_VARIANT),\
-		    $(PRIVATE_VENDOR_VARIANT),\
-		    $(PRIVATE_TOOLS_PREFIX))
+	$(call verify-vndk-libs-identical,\
+	    $(PRIVATE_CORE_VARIANT),\
+	    $(PRIVATE_VENDOR_VARIANT),\
+	    $(PRIVATE_TOOLS_PREFIX))
+	touch $@
 
   $(LOCAL_BUILT_MODULE): $(same_vndk_variants_stamp)
 endif
diff --git a/core/tasks/general-tests.mk b/core/tasks/general-tests.mk
index 7bcc915..53ebddc 100644
--- a/core/tasks/general-tests.mk
+++ b/core/tasks/general-tests.mk
@@ -14,10 +14,12 @@
 
 .PHONY: general-tests
 
+# TODO(b/149249068): Remove vts-tradefed.jar after all VTS tests are converted
 general_tests_tools := \
     $(HOST_OUT_JAVA_LIBRARIES)/cts-tradefed.jar \
     $(HOST_OUT_JAVA_LIBRARIES)/compatibility-host-util.jar \
     $(HOST_OUT_JAVA_LIBRARIES)/vts-core-tradefed.jar \
+    $(HOST_OUT_JAVA_LIBRARIES)/vts-tradefed.jar
 
 intermediates_dir := $(call intermediates-dir-for,PACKAGING,general-tests)
 general_tests_zip := $(PRODUCT_OUT)/general-tests.zip
diff --git a/target/product/base_system.mk b/target/product/base_system.mk
index 1652020..b795dbb 100644
--- a/target/product/base_system.mk
+++ b/target/product/base_system.mk
@@ -59,7 +59,6 @@
     com.android.resolv \
     com.android.neuralnetworks \
     com.android.sdkext \
-    com.android.telephony \
     com.android.tethering \
     com.android.tzdata \
     ContactsProvider \
diff --git a/target/product/gsi/current.txt b/target/product/gsi/current.txt
index 1b8c014..0c1f788 100644
--- a/target/product/gsi/current.txt
+++ b/target/product/gsi/current.txt
@@ -161,7 +161,6 @@
 VNDK-core: android.hardware.radio.config@1.0.so
 VNDK-core: android.hardware.radio.config@1.1.so
 VNDK-core: android.hardware.radio.config@1.2.so
-VNDK-core: android.hardware.radio.config@1.3.so
 VNDK-core: android.hardware.radio.deprecated@1.0.so
 VNDK-core: android.hardware.radio@1.0.so
 VNDK-core: android.hardware.radio@1.1.so
diff --git a/tools/releasetools/sign_target_files_apks.py b/tools/releasetools/sign_target_files_apks.py
index cce771c..5b7c2ac 100755
--- a/tools/releasetools/sign_target_files_apks.py
+++ b/tools/releasetools/sign_target_files_apks.py
@@ -91,6 +91,14 @@
       Replace the veritykeyid in BOOT/cmdline of input_target_file_zip
       with keyid of the cert pointed by <path_to_X509_PEM_cert_file>.
 
+  --remove_avb_public_keys <key1>,<key2>,...
+      Remove AVB public keys from the first-stage ramdisk. The key file to
+      remove is located at either of the following dirs:
+        - BOOT/RAMDISK/avb/ or
+        - BOOT/RAMDISK/first_stage_ramdisk/avb/
+      The second dir will be used for lookup if BOARD_USES_RECOVERY_AS_BOOT is
+      set to true.
+
   --avb_{boot,system,system_other,vendor,dtbo,vbmeta,vbmeta_system,
          vbmeta_vendor}_algorithm <algorithm>
   --avb_{boot,system,system_other,vendor,dtbo,vbmeta,vbmeta_system,
@@ -150,6 +158,7 @@
 OPTIONS.replace_verity_public_key = False
 OPTIONS.replace_verity_private_key = False
 OPTIONS.replace_verity_keyid = False
+OPTIONS.remove_avb_public_keys = None
 OPTIONS.tag_changes = ("-test-keys", "-dev-keys", "+release-keys")
 OPTIONS.avb_keys = {}
 OPTIONS.avb_algorithms = {}
@@ -585,6 +594,18 @@
           filename in ("BOOT/RAMDISK/verity_key",
                        "ROOT/verity_key")):
       pass
+    elif (OPTIONS.remove_avb_public_keys and
+          (filename.startswith("BOOT/RAMDISK/avb/") or
+           filename.startswith("BOOT/RAMDISK/first_stage_ramdisk/avb/"))):
+        matched_removal = False
+        for key_to_remove in OPTIONS.remove_avb_public_keys:
+          if filename.endswith(key_to_remove):
+            matched_removal = True
+            print("Removing AVB public key from ramdisk: %s" % filename)
+            break
+        if not matched_removal:
+          # Copy it verbatim if we don't want to remove it.
+          common.ZipWriteStr(output_tf_zip, out_info, data)
 
     # Skip verity keyid (for system_root_image use) if we will replace it.
     elif OPTIONS.replace_verity_keyid and filename == "BOOT/cmdline":
@@ -610,8 +631,7 @@
     # Should NOT sign boot-debug.img.
     elif filename in (
         "BOOT/RAMDISK/force_debuggable",
-        "RECOVERY/RAMDISK/force_debuggable"
-        "RECOVERY/RAMDISK/first_stage_ramdisk/force_debuggable"):
+        "BOOT/RAMDISK/first_stage_ramdisk/force_debuggable"):
       raise common.ExternalError("debuggable boot.img cannot be signed")
 
     # A non-APK file; copy it verbatim.
@@ -1135,6 +1155,8 @@
       OPTIONS.replace_verity_private_key = (True, a)
     elif o == "--replace_verity_keyid":
       OPTIONS.replace_verity_keyid = (True, a)
+    elif o == "--remove_avb_public_keys":
+      OPTIONS.remove_avb_public_keys = a.split(",")
     elif o == "--avb_vbmeta_key":
       OPTIONS.avb_keys['vbmeta'] = a
     elif o == "--avb_vbmeta_algorithm":
@@ -1203,6 +1225,7 @@
           "replace_verity_public_key=",
           "replace_verity_private_key=",
           "replace_verity_keyid=",
+          "remove_avb_public_keys=",
           "avb_apex_extra_args=",
           "avb_vbmeta_algorithm=",
           "avb_vbmeta_key=",
diff --git a/tools/releasetools/sparse_img.py b/tools/releasetools/sparse_img.py
index 6a91cf4..524c0f2 100644
--- a/tools/releasetools/sparse_img.py
+++ b/tools/releasetools/sparse_img.py
@@ -250,13 +250,17 @@
     with open(fn) as f:
       for line in f:
         fn, ranges_text = line.rstrip().split(None, 1)
-        ranges = rangelib.RangeSet.parse(ranges_text)
+        raw_ranges = rangelib.RangeSet.parse(ranges_text)
 
         # Note: e2fsdroid records holes in the extent tree as "0" blocks.
         # This causes confusion because clobbered_blocks always includes
         # the superblock (physical block #0). Since the 0 blocks here do
         # not represent actual physical blocks, remove them from the set.
-        ranges = ranges.subtract(rangelib.RangeSet("0"))
+        ranges = raw_ranges.subtract(rangelib.RangeSet("0"))
+        # b/150334561 we need to perserve the monotonic property of the raw
+        # range. Otherwise, the validation script will read the blocks with
+        # wrong order when pulling files from the image.
+        ranges.monotonic = raw_ranges.monotonic
         ranges.extra['text_str'] = ranges_text
 
         if allow_shared_blocks:
diff --git a/tools/warn/chrome_project_list.py b/tools/warn/chrome_project_list.py
new file mode 100644
index 0000000..6096522
--- /dev/null
+++ b/tools/warn/chrome_project_list.py
@@ -0,0 +1,686 @@
+# python3
+"""Clang_Tidy_Warn Project List data for Chrome.
+
+This file stores the Chrome project_list used in warn.py and
+its dependencies. It has been put into this file for easier navigation and
+unification of the Chrome and Android warn.py.
+"""
+
+
+def create_pattern(pattern):
+  return [pattern, '(^|.*/)' + pattern + '/.*: warning:']
+
+
+# A list of [project_name, file_path_pattern].
+project_list = [
+    create_pattern('android_webview'),
+    create_pattern('apps'),
+    create_pattern('ash/app_list'),
+    create_pattern('ash/public'),
+    create_pattern('ash/assistant'),
+    create_pattern('ash/display'),
+    create_pattern('ash/resources'),
+    create_pattern('ash/login'),
+    create_pattern('ash/system'),
+    create_pattern('ash/wm'),
+    create_pattern('ash/shelf'),
+    create_pattern('ash'),
+    create_pattern('base/trace_event'),
+    create_pattern('base/debug'),
+    create_pattern('base/third_party'),
+    create_pattern('base/files'),
+    create_pattern('base/test'),
+    create_pattern('base/util'),
+    create_pattern('base/task'),
+    create_pattern('base/metrics'),
+    create_pattern('base/strings'),
+    create_pattern('base/memory'),
+    create_pattern('base'),
+    create_pattern('build'),
+    create_pattern('build_overrides'),
+    create_pattern('buildtools'),
+    create_pattern('cc'),
+    create_pattern('chrome/services'),
+    create_pattern('chrome/app'),
+    create_pattern('chrome/renderer'),
+    create_pattern('chrome/test'),
+    create_pattern('chrome/common/safe_browsing'),
+    create_pattern('chrome/common/importer'),
+    create_pattern('chrome/common/media_router'),
+    create_pattern('chrome/common/extensions'),
+    create_pattern('chrome/common'),
+    create_pattern('chrome/browser/sync_file_system'),
+    create_pattern('chrome/browser/safe_browsing'),
+    create_pattern('chrome/browser/download'),
+    create_pattern('chrome/browser/ui'),
+    create_pattern('chrome/browser/supervised_user'),
+    create_pattern('chrome/browser/search'),
+    create_pattern('chrome/browser/browsing_data'),
+    create_pattern('chrome/browser/predictors'),
+    create_pattern('chrome/browser/net'),
+    create_pattern('chrome/browser/devtools'),
+    create_pattern('chrome/browser/resource_coordinator'),
+    create_pattern('chrome/browser/page_load_metrics'),
+    create_pattern('chrome/browser/extensions'),
+    create_pattern('chrome/browser/ssl'),
+    create_pattern('chrome/browser/printing'),
+    create_pattern('chrome/browser/profiles'),
+    create_pattern('chrome/browser/chromeos'),
+    create_pattern('chrome/browser/performance_manager'),
+    create_pattern('chrome/browser/metrics'),
+    create_pattern('chrome/browser/component_updater'),
+    create_pattern('chrome/browser/media'),
+    create_pattern('chrome/browser/notifications'),
+    create_pattern('chrome/browser/web_applications'),
+    create_pattern('chrome/browser/media_galleries'),
+    create_pattern('chrome/browser'),
+    create_pattern('chrome'),
+    create_pattern('chromecast'),
+    create_pattern('chromeos/services'),
+    create_pattern('chromeos/dbus'),
+    create_pattern('chromeos/assistant'),
+    create_pattern('chromeos/components'),
+    create_pattern('chromeos/settings'),
+    create_pattern('chromeos/constants'),
+    create_pattern('chromeos/network'),
+    create_pattern('chromeos'),
+    create_pattern('cloud_print'),
+    create_pattern('components/crash'),
+    create_pattern('components/subresource_filter'),
+    create_pattern('components/invalidation'),
+    create_pattern('components/autofill'),
+    create_pattern('components/onc'),
+    create_pattern('components/arc'),
+    create_pattern('components/safe_browsing'),
+    create_pattern('components/services'),
+    create_pattern('components/cast_channel'),
+    create_pattern('components/download'),
+    create_pattern('components/feed'),
+    create_pattern('components/offline_pages'),
+    create_pattern('components/bookmarks'),
+    create_pattern('components/cloud_devices'),
+    create_pattern('components/mirroring'),
+    create_pattern('components/spellcheck'),
+    create_pattern('components/viz'),
+    create_pattern('components/gcm_driver'),
+    create_pattern('components/ntp_snippets'),
+    create_pattern('components/translate'),
+    create_pattern('components/search_engines'),
+    create_pattern('components/background_task_scheduler'),
+    create_pattern('components/signin'),
+    create_pattern('components/chromeos_camera'),
+    create_pattern('components/reading_list'),
+    create_pattern('components/assist_ranker'),
+    create_pattern('components/payments'),
+    create_pattern('components/feedback'),
+    create_pattern('components/ui_devtools'),
+    create_pattern('components/password_manager'),
+    create_pattern('components/omnibox'),
+    create_pattern('components/content_settings'),
+    create_pattern('components/dom_distiller'),
+    create_pattern('components/nacl'),
+    create_pattern('components/metrics'),
+    create_pattern('components/policy'),
+    create_pattern('components/optimization_guide'),
+    create_pattern('components/exo'),
+    create_pattern('components/update_client'),
+    create_pattern('components/data_reduction_proxy'),
+    create_pattern('components/sync'),
+    create_pattern('components/drive'),
+    create_pattern('components/variations'),
+    create_pattern('components/history'),
+    create_pattern('components/webcrypto'),
+    create_pattern('components'),
+    create_pattern('content/public'),
+    create_pattern('content/renderer'),
+    create_pattern('content/test'),
+    create_pattern('content/common'),
+    create_pattern('content/browser'),
+    create_pattern('content/zygote'),
+    create_pattern('content'),
+    create_pattern('courgette'),
+    create_pattern('crypto'),
+    create_pattern('dbus'),
+    create_pattern('device/base'),
+    create_pattern('device/vr'),
+    create_pattern('device/gamepad'),
+    create_pattern('device/test'),
+    create_pattern('device/fido'),
+    create_pattern('device/bluetooth'),
+    create_pattern('device'),
+    create_pattern('docs'),
+    create_pattern('extensions/docs'),
+    create_pattern('extensions/components'),
+    create_pattern('extensions/buildflags'),
+    create_pattern('extensions/renderer'),
+    create_pattern('extensions/test'),
+    create_pattern('extensions/common'),
+    create_pattern('extensions/shell'),
+    create_pattern('extensions/browser'),
+    create_pattern('extensions/strings'),
+    create_pattern('extensions'),
+    create_pattern('fuchsia'),
+    create_pattern('gin'),
+    create_pattern('google_apis'),
+    create_pattern('google_update'),
+    create_pattern('gpu/perftests'),
+    create_pattern('gpu/GLES2'),
+    create_pattern('gpu/command_buffer'),
+    create_pattern('gpu/tools'),
+    create_pattern('gpu/gles2_conform_support'),
+    create_pattern('gpu/ipc'),
+    create_pattern('gpu/khronos_glcts_support'),
+    create_pattern('gpu'),
+    create_pattern('headless'),
+    create_pattern('infra'),
+    create_pattern('ipc'),
+    create_pattern('jingle'),
+    create_pattern('media'),
+    create_pattern('mojo'),
+    create_pattern('native_client'),
+    create_pattern('ative_client_sdk'),
+    create_pattern('net'),
+    create_pattern('out'),
+    create_pattern('pdf'),
+    create_pattern('ppapi'),
+    create_pattern('printing'),
+    create_pattern('remoting'),
+    create_pattern('rlz'),
+    create_pattern('sandbox'),
+    create_pattern('services/audio'),
+    create_pattern('services/content'),
+    create_pattern('services/data_decoder'),
+    create_pattern('services/device'),
+    create_pattern('services/file'),
+    create_pattern('services/identity'),
+    create_pattern('services/image_annotation'),
+    create_pattern('services/media_session'),
+    create_pattern('services/metrics'),
+    create_pattern('services/network'),
+    create_pattern('services/preferences'),
+    create_pattern('services/proxy_resolver'),
+    create_pattern('services/resource_coordinator'),
+    create_pattern('services/service_manager'),
+    create_pattern('services/shape_detection'),
+    create_pattern('services/strings'),
+    create_pattern('services/test'),
+    create_pattern('services/tracing'),
+    create_pattern('services/video_capture'),
+    create_pattern('services/viz'),
+    create_pattern('services/ws'),
+    create_pattern('services'),
+    create_pattern('skia/config'),
+    create_pattern('skia/ext'),
+    create_pattern('skia/public'),
+    create_pattern('skia/tools'),
+    create_pattern('skia'),
+    create_pattern('sql'),
+    create_pattern('storage'),
+    create_pattern('styleguide'),
+    create_pattern('testing'),
+    create_pattern('third_party/Python-Markdown'),
+    create_pattern('third_party/SPIRV-Tools'),
+    create_pattern('third_party/abseil-cpp'),
+    create_pattern('third_party/accessibility-audit'),
+    create_pattern('third_party/accessibility_test_framework'),
+    create_pattern('third_party/adobe'),
+    create_pattern('third_party/afl'),
+    create_pattern('third_party/android_build_tools'),
+    create_pattern('third_party/android_crazy_linker'),
+    create_pattern('third_party/android_data_chart'),
+    create_pattern('third_party/android_deps'),
+    create_pattern('third_party/android_media'),
+    create_pattern('third_party/android_ndk'),
+    create_pattern('third_party/android_opengl'),
+    create_pattern('third_party/android_platform'),
+    create_pattern('third_party/android_protobuf'),
+    create_pattern('third_party/android_sdk'),
+    create_pattern('third_party/android_support_test_runner'),
+    create_pattern('third_party/android_swipe_refresh'),
+    create_pattern('third_party/android_system_sdk'),
+    create_pattern('third_party/android_tools'),
+    create_pattern('third_party/angle'),
+    create_pattern('third_party/apache-mac'),
+    create_pattern('third_party/apache-portable-runtime'),
+    create_pattern('third_party/apache-win32'),
+    create_pattern('third_party/apk-patch-size-estimator'),
+    create_pattern('third_party/apple_apsl'),
+    create_pattern('third_party/arcore-android-sdk'),
+    create_pattern('third_party/ashmem'),
+    create_pattern('third_party/auto'),
+    create_pattern('third_party/axe-core'),
+    create_pattern('third_party/bazel'),
+    create_pattern('third_party/binutils'),
+    create_pattern('third_party/bison'),
+    create_pattern('third_party/blanketjs'),
+    create_pattern('third_party/blink/common'),
+    create_pattern('third_party/blink/manual_tests'),
+    create_pattern('third_party/blink/perf_tests'),
+    create_pattern('third_party/blink/public/common'),
+    create_pattern('third_party/blink/public/default_100_percent'),
+    create_pattern('third_party/blink/public/default_200_percent'),
+    create_pattern('third_party/blink/public/platform'),
+    create_pattern('third_party/blink/public/mojom/ad_tagging'),
+    create_pattern('third_party/blink/public/mojom/app_banner'),
+    create_pattern('third_party/blink/public/mojom/appcache'),
+    create_pattern('third_party/blink/public/mojom/array_buffer'),
+    create_pattern('third_party/blink/public/mojom/associated_interfaces'),
+    create_pattern('third_party/blink/public/mojom/autoplay'),
+    create_pattern('third_party/blink/public/mojom/background_fetch'),
+    create_pattern('third_party/blink/public/mojom/background_sync'),
+    create_pattern('third_party/blink/public/mojom/badging'),
+    create_pattern('third_party/blink/public/mojom/blob'),
+    create_pattern('third_party/blink/public/mojom/bluetooth'),
+    create_pattern('third_party/blink/public/mojom/broadcastchannel'),
+    create_pattern('third_party/blink/public/mojom/cache_storage'),
+    create_pattern('third_party/blink/public/mojom/choosers'),
+    create_pattern('third_party/blink/public/mojom/clipboard'),
+    create_pattern('third_party/blink/public/mojom/commit_result'),
+    create_pattern('third_party/blink/public/mojom/contacts'),
+    create_pattern('third_party/blink/public/mojom/cookie_store'),
+    create_pattern('third_party/blink/public/mojom/crash'),
+    create_pattern('third_party/blink/public/mojom/credentialmanager'),
+    create_pattern('third_party/blink/public/mojom/csp'),
+    create_pattern('third_party/blink/public/mojom/devtools'),
+    create_pattern('third_party/blink/public/mojom/document_metadata'),
+    create_pattern('third_party/blink/public/mojom/dom_storage'),
+    create_pattern('third_party/blink/public/mojom/dwrite_font_proxy'),
+    create_pattern('third_party/blink/public/mojom/feature_policy'),
+    create_pattern('third_party/blink/public/mojom/fetch'),
+    create_pattern('third_party/blink/public/mojom/file'),
+    create_pattern('third_party/blink/public/mojom/filesystem'),
+    create_pattern('third_party/blink/public/mojom/font_unique_name_lookup'),
+    create_pattern('third_party/blink/public/mojom/frame'),
+    create_pattern('third_party/blink/public/mojom/frame_sinks'),
+    create_pattern('third_party/blink/public/mojom/geolocation'),
+    create_pattern('third_party/blink/public/mojom/hyphenation'),
+    create_pattern('third_party/blink/public/mojom/idle'),
+    create_pattern('third_party/blink/public/mojom/indexeddb'),
+    create_pattern('third_party/blink/public/mojom/input'),
+    create_pattern('third_party/blink/public/mojom/insecure_input'),
+    create_pattern('third_party/blink/public/mojom/installation'),
+    create_pattern('third_party/blink/public/mojom/installedapp'),
+    create_pattern('third_party/blink/public/mojom/keyboard_lock'),
+    create_pattern('third_party/blink/public/mojom/leak_detector'),
+    create_pattern('third_party/blink/public/mojom/loader'),
+    create_pattern('third_party/blink/public/mojom/locks'),
+    create_pattern('third_party/blink/public/mojom/manifest'),
+    create_pattern('third_party/blink/public/mojom/media_controls'),
+    create_pattern('third_party/blink/public/mojom/mediasession'),
+    create_pattern('third_party/blink/public/mojom/mediastream'),
+    create_pattern('third_party/blink/public/mojom/messaging'),
+    create_pattern('third_party/blink/public/mojom/mime'),
+    create_pattern('third_party/blink/public/mojom/native_file_system'),
+    create_pattern('third_party/blink/public/mojom/net'),
+    create_pattern('third_party/blink/public/mojom/notifications'),
+    create_pattern('third_party/blink/public/mojom/oom_intervention'),
+    create_pattern('third_party/blink/public/mojom/page'),
+    create_pattern('third_party/blink/public/mojom/payments'),
+    create_pattern('third_party/blink/public/mojom/permissions'),
+    create_pattern('third_party/blink/public/mojom/picture_in_picture'),
+    create_pattern('third_party/blink/public/mojom/plugins'),
+    create_pattern('third_party/blink/public/mojom/portal'),
+    create_pattern('third_party/blink/public/mojom/presentation'),
+    create_pattern('third_party/blink/public/mojom/push_messaging'),
+    create_pattern('third_party/blink/public/mojom/quota'),
+    create_pattern('third_party/blink/public/mojom/remote_objects'),
+    create_pattern('third_party/blink/public/mojom/reporting'),
+    create_pattern('third_party/blink/public/mojom/script'),
+    create_pattern('third_party/blink/public/mojom/selection_menu'),
+    create_pattern('third_party/blink/public/mojom/serial'),
+    create_pattern('third_party/blink/public/mojom/service_worker'),
+    create_pattern('third_party/blink/public/mojom/site_engagement'),
+    create_pattern('third_party/blink/public/mojom/sms'),
+    create_pattern('third_party/blink/public/mojom/speech'),
+    create_pattern('third_party/blink/public/mojom/ukm'),
+    create_pattern('third_party/blink/public/mojom/unhandled_tap_notifier'),
+    create_pattern('third_party/blink/public/mojom/usb'),
+    create_pattern('third_party/blink/public/mojom/use_counter'),
+    create_pattern('third_party/blink/public/mojom/user_agent'),
+    create_pattern('third_party/blink/public/mojom/wake_lock'),
+    create_pattern('third_party/blink/public/mojom/web_client_hints'),
+    create_pattern('third_party/blink/public/mojom/web_feature'),
+    create_pattern('third_party/blink/public/mojom/webaudio'),
+    create_pattern('third_party/blink/public/mojom/webauthn'),
+    create_pattern('third_party/blink/public/mojom/webdatabase'),
+    create_pattern('third_party/blink/public/mojom/webshare'),
+    create_pattern('third_party/blink/public/mojom/window_features'),
+    create_pattern('third_party/blink/public/mojom/worker'),
+    create_pattern('third_party/blink/public/web'),
+    create_pattern('third_party/blink/renderer/bindings'),
+    create_pattern('third_party/blink/renderer/build'),
+    create_pattern('third_party/blink/renderer/controller'),
+    create_pattern('third_party/blink/renderer/core/accessibility'),
+    create_pattern('third_party/blink/renderer/core/animation'),
+    create_pattern('third_party/blink/renderer/core/aom'),
+    create_pattern('third_party/blink/renderer/core/clipboard'),
+    create_pattern('third_party/blink/renderer/core/content_capture'),
+    create_pattern('third_party/blink/renderer/core/context_features'),
+    create_pattern('third_party/blink/renderer/core/css'),
+    create_pattern('third_party/blink/renderer/core/display_lock'),
+    create_pattern('third_party/blink/renderer/core/dom'),
+    create_pattern('third_party/blink/renderer/core/editing'),
+    create_pattern('third_party/blink/renderer/core/events'),
+    create_pattern('third_party/blink/renderer/core/execution_context'),
+    create_pattern('third_party/blink/renderer/core/exported'),
+    create_pattern('third_party/blink/renderer/core/feature_policy'),
+    create_pattern('third_party/blink/renderer/core/fetch'),
+    create_pattern('third_party/blink/renderer/core/fileapi'),
+    create_pattern('third_party/blink/renderer/core/frame'),
+    create_pattern('third_party/blink/renderer/core/fullscreen'),
+    create_pattern('third_party/blink/renderer/core/geometry'),
+    create_pattern('third_party/blink/renderer/core/html'),
+    create_pattern('third_party/blink/renderer/core/imagebitmap'),
+    create_pattern('third_party/blink/renderer/core/input'),
+    create_pattern('third_party/blink/renderer/core/inspector'),
+    create_pattern('third_party/blink/renderer/core/intersection_observer'),
+    create_pattern('third_party/blink/renderer/core/invisible_dom'),
+    create_pattern('third_party/blink/renderer/core/layout'),
+    create_pattern('third_party/blink/renderer/core/loader'),
+    create_pattern('third_party/blink/renderer/core/messaging'),
+    create_pattern('third_party/blink/renderer/core/mojo'),
+    create_pattern('third_party/blink/renderer/core/offscreencanvas'),
+    create_pattern('third_party/blink/renderer/core/origin_trials'),
+    create_pattern('third_party/blink/renderer/core/page'),
+    create_pattern('third_party/blink/renderer/core/paint'),
+    create_pattern('third_party/blink/renderer/core/probe'),
+    create_pattern('third_party/blink/renderer/core/resize_observer'),
+    create_pattern('third_party/blink/renderer/core/scheduler'),
+    create_pattern('third_party/blink/renderer/core/script'),
+    create_pattern('third_party/blink/renderer/core/scroll'),
+    create_pattern('third_party/blink/renderer/core/streams'),
+    create_pattern('third_party/blink/renderer/core/style'),
+    create_pattern('third_party/blink/renderer/core/svg'),
+    create_pattern('third_party/blink/renderer/core/testing'),
+    create_pattern('third_party/blink/renderer/core/timezone'),
+    create_pattern('third_party/blink/renderer/core/timing'),
+    create_pattern('third_party/blink/renderer/core/trustedtypes'),
+    create_pattern('third_party/blink/renderer/core/typed_arrays'),
+    create_pattern('third_party/blink/renderer/core/url'),
+    create_pattern('third_party/blink/renderer/core/win'),
+    create_pattern('third_party/blink/renderer/core/workers'),
+    create_pattern('third_party/blink/renderer/core/xml'),
+    create_pattern('third_party/blink/renderer/core/xmlhttprequest'),
+    create_pattern('third_party/blink/renderer/devtools'),
+    create_pattern('third_party/blink/renderer/modules'),
+    create_pattern('third_party/blink/renderer/platform'),
+    create_pattern('third_party/blink/tools'),
+    create_pattern('third_party/blink/web_tests'),
+    create_pattern('third_party/boringssl'),
+    create_pattern('third_party/bouncycastle'),
+    create_pattern('third_party/breakpad'),
+    create_pattern('third_party/brotli'),
+    create_pattern('third_party/bspatch'),
+    create_pattern('third_party/byte_buddy'),
+    create_pattern('third_party/cacheinvalidation'),
+    create_pattern('third_party/catapult'),
+    create_pattern('third_party/cct_dynamic_module'),
+    create_pattern('third_party/ced'),
+    create_pattern('third_party/chaijs'),
+    create_pattern('third_party/checkstyle'),
+    create_pattern('third_party/chromevox'),
+    create_pattern('third_party/chromite'),
+    create_pattern('third_party/cld_3'),
+    create_pattern('third_party/closure_compiler'),
+    create_pattern('third_party/colorama'),
+    create_pattern('third_party/crashpad'),
+    create_pattern('third_party/crc32c'),
+    create_pattern('third_party/cros_system_api'),
+    create_pattern('third_party/custom_tabs_client'),
+    create_pattern('third_party/d3'),
+    create_pattern('third_party/dav1d'),
+    create_pattern('third_party/dawn'),
+    create_pattern('third_party/decklink'),
+    create_pattern('third_party/depot_tools'),
+    create_pattern('third_party/devscripts'),
+    create_pattern('third_party/devtools-node-modules'),
+    create_pattern('third_party/dom_distiller_js'),
+    create_pattern('third_party/elfutils'),
+    create_pattern('third_party/emoji-segmenter'),
+    create_pattern('third_party/errorprone'),
+    create_pattern('third_party/espresso'),
+    create_pattern('third_party/expat'),
+    create_pattern('third_party/feed'),
+    create_pattern('third_party/ffmpeg'),
+    create_pattern('third_party/flac'),
+    create_pattern('third_party/flatbuffers'),
+    create_pattern('third_party/flot'),
+    create_pattern('third_party/fontconfig'),
+    create_pattern('third_party/freetype'),
+    create_pattern('third_party/fuchsia-sdk'),
+    create_pattern('third_party/gestures'),
+    create_pattern('third_party/gif_player'),
+    create_pattern('third_party/glfw'),
+    create_pattern('third_party/glslang'),
+    create_pattern('third_party/gnu_binutils'),
+    create_pattern('third_party/google-truth'),
+    create_pattern('third_party/google_android_play_core'),
+    create_pattern('third_party/google_appengine_cloudstorage'),
+    create_pattern('third_party/google_input_tools'),
+    create_pattern('third_party/google_toolbox_for_mac'),
+    create_pattern('third_party/google_trust_services'),
+    create_pattern('third_party/googletest'),
+    create_pattern('third_party/gperf'),
+    create_pattern('third_party/gradle_wrapper'),
+    create_pattern('third_party/grpc'),
+    create_pattern('third_party/gson'),
+    create_pattern('third_party/guava'),
+    create_pattern('third_party/gvr-android-keyboard'),
+    create_pattern('third_party/gvr-android-sdk'),
+    create_pattern('third_party/hamcrest'),
+    create_pattern('third_party/harfbuzz-ng'),
+    create_pattern('third_party/hunspell'),
+    create_pattern('third_party/hunspell_dictionaries'),
+    create_pattern('third_party/iaccessible2'),
+    create_pattern('third_party/iccjpeg'),
+    create_pattern('third_party/icu/android'),
+    create_pattern('third_party/icu/android_small'),
+    create_pattern('third_party/icu/cast'),
+    create_pattern('third_party/icu/chromeos'),
+    create_pattern('third_party/icu/common'),
+    create_pattern('third_party/icu/filters'),
+    create_pattern('third_party/icu/flutter'),
+    create_pattern('third_party/icu/fuzzers'),
+    create_pattern('third_party/icu/ios'),
+    create_pattern('third_party/icu/patches'),
+    create_pattern('third_party/icu/scripts'),
+    create_pattern('third_party/icu/source'),
+    create_pattern('third_party/icu/tzres'),
+    create_pattern('third_party/icu4j'),
+    create_pattern('third_party/ijar'),
+    create_pattern('third_party/ink'),
+    create_pattern('third_party/inspector_protocol'),
+    create_pattern('third_party/instrumented_libraries'),
+    create_pattern('third_party/intellij'),
+    create_pattern('third_party/isimpledom'),
+    create_pattern('third_party/jacoco'),
+    create_pattern('third_party/jinja2'),
+    create_pattern('third_party/jsoncpp'),
+    create_pattern('third_party/jsr-305'),
+    create_pattern('third_party/jstemplate'),
+    create_pattern('third_party/junit'),
+    create_pattern('third_party/khronos'),
+    create_pattern('third_party/lcov'),
+    create_pattern('third_party/leveldatabase'),
+    create_pattern('third_party/libFuzzer'),
+    create_pattern('third_party/libXNVCtrl'),
+    create_pattern('third_party/libaddressinput'),
+    create_pattern('third_party/libaom'),
+    create_pattern('third_party/libcxx-pretty-printers'),
+    create_pattern('third_party/libdrm'),
+    create_pattern('third_party/libevdev'),
+    create_pattern('third_party/libjingle_xmpp'),
+    create_pattern('third_party/libjpeg'),
+    create_pattern('third_party/libjpeg_turbo'),
+    create_pattern('third_party/liblouis'),
+    create_pattern('third_party/libovr'),
+    create_pattern('third_party/libphonenumber'),
+    create_pattern('third_party/libpng'),
+    create_pattern('third_party/libprotobuf-mutator'),
+    create_pattern('third_party/libsecret'),
+    create_pattern('third_party/libsrtp'),
+    create_pattern('third_party/libsync'),
+    create_pattern('third_party/libudev'),
+    create_pattern('third_party/libusb'),
+    create_pattern('third_party/libvpx'),
+    create_pattern('third_party/libwebm'),
+    create_pattern('third_party/libwebp'),
+    create_pattern('third_party/libxml'),
+    create_pattern('third_party/libxslt'),
+    create_pattern('third_party/libyuv'),
+    create_pattern('third_party/lighttpd'),
+    create_pattern('third_party/logilab'),
+    create_pattern('third_party/lss'),
+    create_pattern('third_party/lzma_sdk'),
+    create_pattern('third_party/mach_override'),
+    create_pattern('third_party/markdown'),
+    create_pattern('third_party/markupsafe'),
+    create_pattern('third_party/material_design_icons'),
+    create_pattern('third_party/mesa_headers'),
+    create_pattern('third_party/metrics_proto'),
+    create_pattern('third_party/microsoft_webauthn'),
+    create_pattern('third_party/mingw-w64'),
+    create_pattern('third_party/minigbm'),
+    create_pattern('third_party/minizip'),
+    create_pattern('third_party/mocha'),
+    create_pattern('third_party/mockito'),
+    create_pattern('third_party/modp_b64'),
+    create_pattern('third_party/motemplate'),
+    create_pattern('third_party/mozilla'),
+    create_pattern('third_party/nacl_sdk_binaries'),
+    create_pattern('third_party/nasm'),
+    create_pattern('third_party/netty-tcnative'),
+    create_pattern('third_party/netty4'),
+    create_pattern('third_party/node'),
+    create_pattern('third_party/nvml'),
+    create_pattern('third_party/objenesis'),
+    create_pattern('third_party/ocmock'),
+    create_pattern('third_party/openh264'),
+    create_pattern('third_party/openscreen'),
+    create_pattern('third_party/openvr'),
+    create_pattern('third_party/opus'),
+    create_pattern('third_party/ots'),
+    create_pattern('third_party/ow2_asm'),
+    create_pattern('third_party/pdfium'),
+    create_pattern('third_party/pefile'),
+    create_pattern('third_party/perfetto'),
+    create_pattern('third_party/perl'),
+    create_pattern('third_party/pexpect'),
+    create_pattern('third_party/pffft'),
+    create_pattern('third_party/ply'),
+    create_pattern('third_party/polymer'),
+    create_pattern('third_party/proguard'),
+    create_pattern('third_party/protobuf'),
+    create_pattern('third_party/protoc_javalite'),
+    create_pattern('third_party/pycoverage'),
+    create_pattern('third_party/pyelftools'),
+    create_pattern('third_party/pyjson5'),
+    create_pattern('third_party/pylint'),
+    create_pattern('third_party/pymock'),
+    create_pattern('third_party/pystache'),
+    create_pattern('third_party/pywebsocket'),
+    create_pattern('third_party/qcms'),
+    create_pattern('third_party/quic_trace'),
+    create_pattern('third_party/qunit'),
+    create_pattern('third_party/r8'),
+    create_pattern('third_party/re2'),
+    create_pattern('third_party/requests'),
+    create_pattern('third_party/rnnoise'),
+    create_pattern('third_party/robolectric'),
+    create_pattern('third_party/s2cellid'),
+    create_pattern('third_party/sfntly'),
+    create_pattern('third_party/shaderc'),
+    create_pattern('third_party/simplejson'),
+    create_pattern('third_party/sinonjs'),
+    create_pattern('third_party/skia'),
+    create_pattern('third_party/smhasher'),
+    create_pattern('third_party/snappy'),
+    create_pattern('third_party/speech-dispatcher'),
+    create_pattern('third_party/spirv-cross'),
+    create_pattern('third_party/spirv-headers'),
+    create_pattern('third_party/sqlite'),
+    create_pattern('third_party/sqlite4java'),
+    create_pattern('third_party/sudden_motion_sensor'),
+    create_pattern('third_party/swiftshader'),
+    create_pattern('third_party/tcmalloc'),
+    create_pattern('third_party/test_fonts'),
+    create_pattern('third_party/tlslite'),
+    create_pattern('third_party/ub-uiautomator'),
+    create_pattern('third_party/unrar'),
+    create_pattern('third_party/usb_ids'),
+    create_pattern('third_party/usrsctp'),
+    create_pattern('third_party/v4l-utils'),
+    create_pattern('third_party/vulkan'),
+    create_pattern('third_party/wayland'),
+    create_pattern('third_party/wayland-protocols'),
+    create_pattern('third_party/wds'),
+    create_pattern('third_party/web-animations-js'),
+    create_pattern('third_party/webdriver'),
+    create_pattern('third_party/webgl'),
+    create_pattern('third_party/webrtc'),
+    create_pattern('third_party/webrtc_overrides'),
+    create_pattern('third_party/webxr_test_pages'),
+    create_pattern('third_party/widevine'),
+    create_pattern('third_party/win_build_output'),
+    create_pattern('third_party/woff2'),
+    create_pattern('third_party/wtl'),
+    create_pattern('third_party/xdg-utils'),
+    create_pattern('third_party/xstream'),
+    create_pattern('third_party/yasm'),
+    create_pattern('third_party/zlib'),
+    create_pattern('tools'),
+    create_pattern('ui/accelerated_widget_mac'),
+    create_pattern('ui/accessibility'),
+    create_pattern('ui/android'),
+    create_pattern('ui/aura'),
+    create_pattern('ui/aura_extra'),
+    create_pattern('ui/base'),
+    create_pattern('ui/chromeos'),
+    create_pattern('ui/compositor'),
+    create_pattern('ui/compositor_extra'),
+    create_pattern('ui/content_accelerators'),
+    create_pattern('ui/display'),
+    create_pattern('ui/events'),
+    create_pattern('ui/file_manager'),
+    create_pattern('ui/gfx'),
+    create_pattern('ui/gl'),
+    create_pattern('ui/latency'),
+    create_pattern('ui/login'),
+    create_pattern('ui/message_center'),
+    create_pattern('ui/native_theme'),
+    create_pattern('ui/ozone'),
+    create_pattern('ui/platform_window'),
+    create_pattern('ui/resources'),
+    create_pattern('ui/shell_dialogs'),
+    create_pattern('ui/snapshot'),
+    create_pattern('ui/strings'),
+    create_pattern('ui/surface'),
+    create_pattern('ui/touch_selection'),
+    create_pattern('ui/views'),
+    create_pattern('ui/views_bridge_mac'),
+    create_pattern('ui/views_content_client'),
+    create_pattern('ui/web_dialogs'),
+    create_pattern('ui/webui'),
+    create_pattern('ui/wm'),
+    create_pattern('url'),
+    create_pattern('v8/benchmarks'),
+    create_pattern('v8/build_overrides'),
+    create_pattern('v8/custom_deps'),
+    create_pattern('v8/docs'),
+    create_pattern('v8/gni'),
+    create_pattern('v8/include'),
+    create_pattern('v8/infra'),
+    create_pattern('v8/samples'),
+    create_pattern('v8/src'),
+    create_pattern('v8/test'),
+    create_pattern('v8/testing'),
+    create_pattern('v8/third_party'),
+    create_pattern('v8/tools'),
+
+    # keep out/obj and other patterns at the end.
+    [
+        'out/obj', '.*/(gen|obj[^/]*)/(include|EXECUTABLES|SHARED_LIBRARIES|'
+        'STATIC_LIBRARIES|NATIVE_TESTS)/.*: warning:'
+    ],
+    ['other', '.*']  # all other unrecognized patterns
+]
diff --git a/tools/warn/html_writer.py b/tools/warn/html_writer.py
new file mode 100644
index 0000000..b8d3fe6
--- /dev/null
+++ b/tools/warn/html_writer.py
@@ -0,0 +1,673 @@
+# Lint as: python3
+# Copyright (C) 2019 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Emit warning messages to html or csv files."""
+
+# To emit html page of warning messages:
+#   flags: --byproject, --url, --separator
+# Old stuff for static html components:
+#   html_script_style:  static html scripts and styles
+#   htmlbig:
+#   dump_stats, dump_html_prologue, dump_html_epilogue:
+#   emit_buttons:
+#   dump_fixed
+#   sort_warnings:
+#   emit_stats_by_project:
+#   all_patterns,
+#   findproject, classify_warning
+#   dump_html
+#
+# New dynamic HTML page's static JavaScript data:
+#   Some data are copied from Python to JavaScript, to generate HTML elements.
+#   FlagPlatform           flags.platform
+#   FlagURL                flags.url, used by 'android'
+#   FlagSeparator          flags.separator, used by 'android'
+#   SeverityColors:        list of colors for all severity levels
+#   SeverityHeaders:       list of headers for all severity levels
+#   SeverityColumnHeaders: list of column_headers for all severity levels
+#   ProjectNames:          project_names, or project_list[*][0]
+#   WarnPatternsSeverity:     warn_patterns[*]['severity']
+#   WarnPatternsDescription:  warn_patterns[*]['description']
+#   WarningMessages:          warning_messages
+#   Warnings:                 warning_records
+#   StatsHeader:           warning count table header row
+#   StatsRows:             array of warning count table rows
+#
+# New dynamic HTML page's dynamic JavaScript data:
+#
+# New dynamic HTML related function to emit data:
+#   escape_string, strip_escape_string, emit_warning_arrays
+#   emit_js_data():
+
+from __future__ import print_function
+import cgi
+import csv
+import sys
+
+# pylint:disable=relative-beyond-top-level
+# pylint:disable=g-importing-member
+from .severity import Severity
+
+
+html_head_scripts = """\
+  <script type="text/javascript">
+  function expand(id) {
+    var e = document.getElementById(id);
+    var f = document.getElementById(id + "_mark");
+    if (e.style.display == 'block') {
+       e.style.display = 'none';
+       f.innerHTML = '&#x2295';
+    }
+    else {
+       e.style.display = 'block';
+       f.innerHTML = '&#x2296';
+    }
+  };
+  function expandCollapse(show) {
+    for (var id = 1; ; id++) {
+      var e = document.getElementById(id + "");
+      var f = document.getElementById(id + "_mark");
+      if (!e || !f) break;
+      e.style.display = (show ? 'block' : 'none');
+      f.innerHTML = (show ? '&#x2296' : '&#x2295');
+    }
+  };
+  </script>
+  <style type="text/css">
+  th,td{border-collapse:collapse; border:1px solid black;}
+  .button{color:blue;font-size:110%;font-weight:bolder;}
+  .bt{color:black;background-color:transparent;border:none;outline:none;
+      font-size:140%;font-weight:bolder;}
+  .c0{background-color:#e0e0e0;}
+  .c1{background-color:#d0d0d0;}
+  .t1{border-collapse:collapse; width:100%; border:1px solid black;}
+  </style>
+  <script src="https://www.gstatic.com/charts/loader.js"></script>
+"""
+
+
+def make_writer(output_stream):
+
+  def writer(text):
+    return output_stream.write(text + '\n')
+
+  return writer
+
+
+def html_big(param):
+  return '<font size="+2">' + param + '</font>'
+
+
+def dump_html_prologue(title, writer, warn_patterns, project_names):
+  writer('<html>\n<head>')
+  writer('<title>' + title + '</title>')
+  writer(html_head_scripts)
+  emit_stats_by_project(writer, warn_patterns, project_names)
+  writer('</head>\n<body>')
+  writer(html_big(title))
+  writer('<p>')
+
+
+def dump_html_epilogue(writer):
+  writer('</body>\n</head>\n</html>')
+
+
+def sort_warnings(warn_patterns):
+  for i in warn_patterns:
+    i['members'] = sorted(set(i['members']))
+
+
+def create_warnings(warn_patterns, project_names):
+  """Creates warnings s.t.
+
+  warnings[p][s] is as specified in above docs.
+
+  Args:
+    warn_patterns: list of warning patterns for specified platform
+    project_names: list of project names
+
+  Returns:
+    2D warnings array where warnings[p][s] is # of warnings in project name p of
+    severity level s
+  """
+  # pylint:disable=g-complex-comprehension
+  warnings = {p: {s.value: 0 for s in Severity.levels} for p in project_names}
+  for i in warn_patterns:
+    s = i['severity'].value
+    for p in i['projects']:
+      warnings[p][s] += i['projects'][p]
+  return warnings
+
+
+def get_total_by_project(warnings, project_names):
+  """Returns dict, project as key and # warnings for that project as value."""
+  # pylint:disable=g-complex-comprehension
+  return {
+      p: sum(warnings[p][s.value] for s in Severity.levels)
+      for p in project_names
+  }
+
+
+def get_total_by_severity(warnings, project_names):
+  """Returns dict, severity as key and # warnings of that severity as value."""
+  # pylint:disable=g-complex-comprehension
+  return {
+      s.value: sum(warnings[p][s.value] for p in project_names)
+      for s in Severity.levels
+  }
+
+
+def emit_table_header(total_by_severity):
+  """Returns list of HTML-formatted content for severity stats."""
+
+  stats_header = ['Project']
+  for s in Severity.levels:
+    if total_by_severity[s.value]:
+      stats_header.append(
+          '<span style=\'background-color:{}\'>{}</span>'.format(
+              s.color, s.column_header))
+  stats_header.append('TOTAL')
+  return stats_header
+
+
+def emit_row_counts_per_project(warnings, total_by_project, total_by_severity,
+                                project_names):
+  """Returns total project warnings and row of stats for each project.
+
+  Args:
+    warnings: output of create_warnings(warn_patterns, project_names)
+    total_by_project: output of get_total_by_project(project_names)
+    total_by_severity: output of get_total_by_severity(project_names)
+    project_names: list of project names
+
+  Returns:
+    total_all_projects, the total number of warnings over all projects
+    stats_rows, a 2d list where each row is [Project Name, <severity counts>,
+    total # warnings for this project]
+  """
+
+  total_all_projects = 0
+  stats_rows = []
+  for p in project_names:
+    if total_by_project[p]:
+      one_row = [p]
+      for s in Severity.levels:
+        if total_by_severity[s.value]:
+          one_row.append(warnings[p][s.value])
+      one_row.append(total_by_project[p])
+      stats_rows.append(one_row)
+      total_all_projects += total_by_project[p]
+  return total_all_projects, stats_rows
+
+
+def emit_row_counts_per_severity(total_by_severity, stats_header, stats_rows,
+                                 total_all_projects, writer):
+  """Emits stats_header and stats_rows as specified above.
+
+  Args:
+    total_by_severity: output of get_total_by_severity()
+    stats_header: output of emit_table_header()
+    stats_rows: output of emit_row_counts_per_project()
+    total_all_projects: output of emit_row_counts_per_project()
+    writer: writer returned by make_writer(output_stream)
+  """
+
+  total_all_severities = 0
+  one_row = ['<b>TOTAL</b>']
+  for s in Severity.levels:
+    if total_by_severity[s.value]:
+      one_row.append(total_by_severity[s.value])
+      total_all_severities += total_by_severity[s.value]
+  one_row.append(total_all_projects)
+  stats_rows.append(one_row)
+  writer('<script>')
+  emit_const_string_array('StatsHeader', stats_header, writer)
+  emit_const_object_array('StatsRows', stats_rows, writer)
+  writer(draw_table_javascript)
+  writer('</script>')
+
+
+def emit_stats_by_project(writer, warn_patterns, project_names):
+  """Dump a google chart table of warnings per project and severity."""
+
+  warnings = create_warnings(warn_patterns, project_names)
+  total_by_project = get_total_by_project(warnings, project_names)
+  total_by_severity = get_total_by_severity(warnings, project_names)
+  stats_header = emit_table_header(total_by_severity)
+  total_all_projects, stats_rows = \
+    emit_row_counts_per_project(warnings, total_by_project, total_by_severity, project_names)
+  emit_row_counts_per_severity(total_by_severity, stats_header, stats_rows,
+                               total_all_projects, writer)
+
+
+def dump_stats(writer, warn_patterns):
+  """Dump some stats about total number of warnings and such."""
+
+  known = 0
+  skipped = 0
+  unknown = 0
+  sort_warnings(warn_patterns)
+  for i in warn_patterns:
+    if i['severity'] == Severity.UNMATCHED:
+      unknown += len(i['members'])
+    elif i['severity'] == Severity.SKIP:
+      skipped += len(i['members'])
+    else:
+      known += len(i['members'])
+  writer('Number of classified warnings: <b>' + str(known) + '</b><br>')
+  writer('Number of skipped warnings: <b>' + str(skipped) + '</b><br>')
+  writer('Number of unclassified warnings: <b>' + str(unknown) + '</b><br>')
+  total = unknown + known + skipped
+  extra_msg = ''
+  if total < 1000:
+    extra_msg = ' (low count may indicate incremental build)'
+  writer('Total number of warnings: <b>' + str(total) + '</b>' + extra_msg)
+
+
+# New base table of warnings, [severity, warn_id, project, warning_message]
+# Need buttons to show warnings in different grouping options.
+# (1) Current, group by severity, id for each warning pattern
+#     sort by severity, warn_id, warning_message
+# (2) Current --byproject, group by severity,
+#     id for each warning pattern + project name
+#     sort by severity, warn_id, project, warning_message
+# (3) New, group by project + severity,
+#     id for each warning pattern
+#     sort by project, severity, warn_id, warning_message
+def emit_buttons(writer):
+  writer('<button class="button" onclick="expandCollapse(1);">'
+         'Expand all warnings</button>\n'
+         '<button class="button" onclick="expandCollapse(0);">'
+         'Collapse all warnings</button>\n'
+         '<button class="button" onclick="groupBySeverity();">'
+         'Group warnings by severity</button>\n'
+         '<button class="button" onclick="groupByProject();">'
+         'Group warnings by project</button><br>')
+
+
+def all_patterns(category):
+  patterns = ''
+  for i in category['patterns']:
+    patterns += i
+    patterns += ' / '
+  return patterns
+
+
+def dump_fixed(writer, warn_patterns):
+  """Show which warnings no longer occur."""
+  anchor = 'fixed_warnings'
+  mark = anchor + '_mark'
+  writer('\n<br><p style="background-color:lightblue"><b>'
+         '<button id="' + mark + '" '
+         'class="bt" onclick="expand(\'' + anchor + '\');">'
+         '&#x2295</button> Fixed warnings. '
+         'No more occurrences. Please consider turning these into '
+         'errors if possible, before they are reintroduced in to the build'
+         ':</b></p>')
+  writer('<blockquote>')
+  fixed_patterns = []
+  for i in warn_patterns:
+    if not i['members']:
+      fixed_patterns.append(i['description'] + ' (' + all_patterns(i) + ')')
+  fixed_patterns = sorted(fixed_patterns)
+  writer('<div id="' + anchor + '" style="display:none;"><table>')
+  cur_row_class = 0
+  for text in fixed_patterns:
+    cur_row_class = 1 - cur_row_class
+    # remove last '\n'
+    t = text[:-1] if text[-1] == '\n' else text
+    writer('<tr><td class="c' + str(cur_row_class) + '">' + t + '</td></tr>')
+  writer('</table></div>')
+  writer('</blockquote>')
+
+
+def write_severity(csvwriter, sev, kind, warn_patterns):
+  """Count warnings of given severity and write CSV entries to writer."""
+  total = 0
+  for pattern in warn_patterns:
+    if pattern['severity'] == sev and pattern['members']:
+      n = len(pattern['members'])
+      total += n
+      warning = kind + ': ' + (pattern['description'] or '?')
+      csvwriter.writerow([n, '', warning])
+      # print number of warnings for each project, ordered by project name
+      projects = sorted(pattern['projects'].keys())
+      for project in projects:
+        csvwriter.writerow([pattern['projects'][project], project, warning])
+  csvwriter.writerow([total, '', kind + ' warnings'])
+  return total
+
+
+def dump_csv(csvwriter, warn_patterns):
+  """Dump number of warnings in CSV format to writer."""
+  sort_warnings(warn_patterns)
+  total = 0
+  for s in Severity.levels:
+    total += write_severity(csvwriter, s, s.column_header, warn_patterns)
+  csvwriter.writerow([total, '', 'All warnings'])
+
+
+# Return s with escaped backslash and quotation characters.
+def escape_string(s):
+  return s.replace('\\', '\\\\').replace('"', '\\"')
+
+
+# Return s without trailing '\n' and escape the quotation characters.
+def strip_escape_string(s):
+  if not s:
+    return s
+  s = s[:-1] if s[-1] == '\n' else s
+  return escape_string(s)
+
+
+def emit_warning_array(name, writer, warn_patterns):
+  writer('var warning_{} = ['.format(name))
+  for w in warn_patterns:
+    if name == 'severity':
+      writer('{},'.format(w[name].value))
+    else:
+      writer('{},'.format(w[name]))
+  writer('];')
+
+
+def emit_warning_arrays(writer, warn_patterns):
+  emit_warning_array('severity', writer, warn_patterns)
+  writer('var warning_description = [')
+  for w in warn_patterns:
+    if w['members']:
+      writer('"{}",'.format(escape_string(w['description'])))
+    else:
+      writer('"",')  # no such warning
+  writer('];')
+
+
+scripts_for_warning_groups = """
+  function compareMessages(x1, x2) { // of the same warning type
+    return (WarningMessages[x1[2]] <= WarningMessages[x2[2]]) ? -1 : 1;
+  }
+  function byMessageCount(x1, x2) {
+    return x2[2] - x1[2];  // reversed order
+  }
+  function bySeverityMessageCount(x1, x2) {
+    // orer by severity first
+    if (x1[1] != x2[1])
+      return  x1[1] - x2[1];
+    return byMessageCount(x1, x2);
+  }
+  const ParseLinePattern = /^([^ :]+):(\\d+):(.+)/;
+  function addURL(line) { // used by Android
+    if (FlagURL == "") return line;
+    if (FlagSeparator == "") {
+      return line.replace(ParseLinePattern,
+        "<a target='_blank' href='" + FlagURL + "/$1'>$1</a>:$2:$3");
+    }
+    return line.replace(ParseLinePattern,
+      "<a target='_blank' href='" + FlagURL + "/$1" + FlagSeparator +
+        "$2'>$1:$2</a>:$3");
+  }
+  function addURLToLine(line, link) { // used by Chrome
+      let line_split = line.split(":");
+      let path = line_split.slice(0,3).join(":");
+      let msg = line_split.slice(3).join(":");
+      let html_link = `<a target="_blank" href="${link}">${path}</a>${msg}`;
+      return html_link;
+  }
+  function createArrayOfDictionaries(n) {
+    var result = [];
+    for (var i=0; i<n; i++) result.push({});
+    return result;
+  }
+  function groupWarningsBySeverity() {
+    // groups is an array of dictionaries,
+    // each dictionary maps from warning type to array of warning messages.
+    var groups = createArrayOfDictionaries(SeverityColors.length);
+    for (var i=0; i<Warnings.length; i++) {
+      var w = Warnings[i][0];
+      var s = WarnPatternsSeverity[w];
+      var k = w.toString();
+      if (!(k in groups[s]))
+        groups[s][k] = [];
+      groups[s][k].push(Warnings[i]);
+    }
+    return groups;
+  }
+  function groupWarningsByProject() {
+    var groups = createArrayOfDictionaries(ProjectNames.length);
+    for (var i=0; i<Warnings.length; i++) {
+      var w = Warnings[i][0];
+      var p = Warnings[i][1];
+      var k = w.toString();
+      if (!(k in groups[p]))
+        groups[p][k] = [];
+      groups[p][k].push(Warnings[i]);
+    }
+    return groups;
+  }
+  var GlobalAnchor = 0;
+  function createWarningSection(header, color, group) {
+    var result = "";
+    var groupKeys = [];
+    var totalMessages = 0;
+    for (var k in group) {
+       totalMessages += group[k].length;
+       groupKeys.push([k, WarnPatternsSeverity[parseInt(k)], group[k].length]);
+    }
+    groupKeys.sort(bySeverityMessageCount);
+    for (var idx=0; idx<groupKeys.length; idx++) {
+      var k = groupKeys[idx][0];
+      var messages = group[k];
+      var w = parseInt(k);
+      var wcolor = SeverityColors[WarnPatternsSeverity[w]];
+      var description = WarnPatternsDescription[w];
+      if (description.length == 0)
+          description = "???";
+      GlobalAnchor += 1;
+      result += "<table class='t1'><tr bgcolor='" + wcolor + "'><td>" +
+                "<button class='bt' id='" + GlobalAnchor + "_mark" +
+                "' onclick='expand(\\"" + GlobalAnchor + "\\");'>" +
+                "&#x2295</button> " +
+                description + " (" + messages.length + ")</td></tr></table>";
+      result += "<div id='" + GlobalAnchor +
+                "' style='display:none;'><table class='t1'>";
+      var c = 0;
+      messages.sort(compareMessages);
+      if (FlagPlatform == "chrome") {
+        for (var i=0; i<messages.length; i++) {
+          result += "<tr><td class='c" + c + "'>" +
+                    addURLToLine(WarningMessages[messages[i][2]], WarningLinks[messages[i][3]]) + "</td></tr>";
+          c = 1 - c;
+        }
+      } else {
+        for (var i=0; i<messages.length; i++) {
+          result += "<tr><td class='c" + c + "'>" +
+                    addURL(WarningMessages[messages[i][2]]) + "</td></tr>";
+          c = 1 - c;
+        }
+      }
+      result += "</table></div>";
+    }
+    if (result.length > 0) {
+      return "<br><span style='background-color:" + color + "'><b>" +
+             header + ": " + totalMessages +
+             "</b></span><blockquote><table class='t1'>" +
+             result + "</table></blockquote>";
+
+    }
+    return "";  // empty section
+  }
+  function generateSectionsBySeverity() {
+    var result = "";
+    var groups = groupWarningsBySeverity();
+    for (s=0; s<SeverityColors.length; s++) {
+      result += createWarningSection(SeverityHeaders[s], SeverityColors[s],
+                                     groups[s]);
+    }
+    return result;
+  }
+  function generateSectionsByProject() {
+    var result = "";
+    var groups = groupWarningsByProject();
+    for (i=0; i<groups.length; i++) {
+      result += createWarningSection(ProjectNames[i], 'lightgrey', groups[i]);
+    }
+    return result;
+  }
+  function groupWarnings(generator) {
+    GlobalAnchor = 0;
+    var e = document.getElementById("warning_groups");
+    e.innerHTML = generator();
+  }
+  function groupBySeverity() {
+    groupWarnings(generateSectionsBySeverity);
+  }
+  function groupByProject() {
+    groupWarnings(generateSectionsByProject);
+  }
+"""
+
+
+# Emit a JavaScript const string
+def emit_const_string(name, value, writer):
+  writer('const ' + name + ' = "' + escape_string(value) + '";')
+
+
+# Emit a JavaScript const integer array.
+def emit_const_int_array(name, array, writer):
+  writer('const ' + name + ' = [')
+  for n in array:
+    writer(str(n) + ',')
+  writer('];')
+
+
+# Emit a JavaScript const string array.
+def emit_const_string_array(name, array, writer):
+  writer('const ' + name + ' = [')
+  for s in array:
+    writer('"' + strip_escape_string(s) + '",')
+  writer('];')
+
+
+# Emit a JavaScript const string array for HTML.
+def emit_const_html_string_array(name, array, writer):
+  writer('const ' + name + ' = [')
+  for s in array:
+    # Not using html.escape yet, to work for both python 2 and 3,
+    # until all users switch to python 3.
+    # pylint:disable=deprecated-method
+    writer('"' + cgi.escape(strip_escape_string(s)) + '",')
+  writer('];')
+
+
+# Emit a JavaScript const object array.
+def emit_const_object_array(name, array, writer):
+  writer('const ' + name + ' = [')
+  for x in array:
+    writer(str(x) + ',')
+  writer('];')
+
+
+def emit_js_data(writer, flags, warning_messages, warning_links,
+                 warning_records, warn_patterns, project_names):
+  """Dump dynamic HTML page's static JavaScript data."""
+  emit_const_string('FlagPlatform', flags.platform, writer)
+  emit_const_string('FlagURL', flags.url, writer)
+  emit_const_string('FlagSeparator', flags.separator, writer)
+  emit_const_string_array('SeverityColors', [s.color for s in Severity.levels],
+                          writer)
+  emit_const_string_array('SeverityHeaders',
+                          [s.header for s in Severity.levels], writer)
+  emit_const_string_array('SeverityColumnHeaders',
+                          [s.column_header for s in Severity.levels], writer)
+  emit_const_string_array('ProjectNames', project_names, writer)
+  # pytype: disable=attribute-error
+  emit_const_int_array('WarnPatternsSeverity',
+                       [w['severity'].value for w in warn_patterns], writer)
+  # pytype: enable=attribute-error
+  emit_const_html_string_array('WarnPatternsDescription',
+                               [w['description'] for w in warn_patterns],
+                               writer)
+  emit_const_html_string_array('WarningMessages', warning_messages, writer)
+  emit_const_object_array('Warnings', warning_records, writer)
+  if flags.platform == 'chrome':
+    emit_const_html_string_array('WarningLinks', warning_links, writer)
+
+
+draw_table_javascript = """
+google.charts.load('current', {'packages':['table']});
+google.charts.setOnLoadCallback(drawTable);
+function drawTable() {
+  var data = new google.visualization.DataTable();
+  data.addColumn('string', StatsHeader[0]);
+  for (var i=1; i<StatsHeader.length; i++) {
+    data.addColumn('number', StatsHeader[i]);
+  }
+  data.addRows(StatsRows);
+  for (var i=0; i<StatsRows.length; i++) {
+    for (var j=0; j<StatsHeader.length; j++) {
+      data.setProperty(i, j, 'style', 'border:1px solid black;');
+    }
+  }
+  var table = new google.visualization.Table(
+      document.getElementById('stats_table'));
+  table.draw(data, {allowHtml: true, alternatingRowStyle: true});
+}
+"""
+
+
+def dump_html(flags, output_stream, warning_messages, warning_links,
+              warning_records, header_str, warn_patterns, project_names):
+  """Dump the flags output to output_stream."""
+  writer = make_writer(output_stream)
+  dump_html_prologue('Warnings for ' + header_str, writer, warn_patterns,
+                     project_names)
+  dump_stats(writer, warn_patterns)
+  writer('<br><div id="stats_table"></div><br>')
+  writer('\n<script>')
+  emit_js_data(writer, flags, warning_messages, warning_links, warning_records,
+               warn_patterns, project_names)
+  writer(scripts_for_warning_groups)
+  writer('</script>')
+  emit_buttons(writer)
+  # Warning messages are grouped by severities or project names.
+  writer('<br><div id="warning_groups"></div>')
+  if flags.byproject:
+    writer('<script>groupByProject();</script>')
+  else:
+    writer('<script>groupBySeverity();</script>')
+  dump_fixed(writer, warn_patterns)
+  dump_html_epilogue(writer)
+
+
+def write_html(flags, project_names, warn_patterns, html_path, warning_messages,
+               warning_links, warning_records, header_str):
+  """Write warnings html file."""
+  if html_path:
+    with open(html_path, 'w') as f:
+      dump_html(flags, f, warning_messages, warning_links, warning_records,
+                header_str, warn_patterns, project_names)
+
+
+def write_out_csv(flags, warn_patterns, warning_messages, warning_links,
+                  warning_records, header_str, project_names):
+  """Write warnings csv file."""
+  if flags.csvpath:
+    with open(flags.csvpath, 'w') as f:
+      dump_csv(csv.writer(f, lineterminator='\n'), warn_patterns)
+
+  if flags.gencsv:
+    dump_csv(csv.writer(sys.stdout, lineterminator='\n'), warn_patterns)
+  else:
+    dump_html(flags, sys.stdout, warning_messages, warning_links,
+              warning_records, header_str, warn_patterns, project_names)
diff --git a/tools/warn/java_warn_patterns.py b/tools/warn/java_warn_patterns.py
index 80e2e1d..17e3864 100644
--- a/tools/warn/java_warn_patterns.py
+++ b/tools/warn/java_warn_patterns.py
@@ -16,8 +16,8 @@
 """Warning patterns for Java compiler tools."""
 
 # pylint:disable=relative-beyond-top-level
-from .cpp_warn_patterns import compile_patterns
 # pylint:disable=g-importing-member
+from .cpp_warn_patterns import compile_patterns
 from .severity import Severity
 
 
@@ -485,16 +485,24 @@
     java_medium('Static method should be qualified',
                 [r'.*\.java:.*: warning: \[static\] static method should be qualified']),
     medium('AbstractInner'),
+    medium('BothPackageInfoAndHtml'),
     medium('CallbackName'),
     medium('ExecutorRegistration'),
+    medium('HiddenTypeParameter'),
     medium('JavaApiUsedByMainlineModule'),
     medium('ListenerLast'),
+    medium('MinMaxConstant'),
     medium('MissingBuildMethod'),
     medium('NoByteOrShort'),
     medium('OverlappingConstants'),
     medium('SetterReturnsThis'),
+    medium('StreamFiles'),
     medium('Typo'),
     medium('UseIcu'),
+    medium('fallthrough'),
+    medium('overrides'),
+    medium('serial'),
+    medium('try'),
     high('AndroidInjectionBeforeSuper',
          'AndroidInjection.inject() should always be invoked before calling super.lifecycleMethod()'),
     high('AndroidJdkLibsChecker',
@@ -783,6 +791,8 @@
     # Other javac tool warnings
     java_medium('addNdkApiCoverage failed to getPackage',
                 [r".*: warning: addNdkApiCoverage failed to getPackage"]),
+    java_medium('bad path element',
+                [r".*: warning: \[path\] bad path element .*\.jar"]),
     java_medium('Supported version from annotation processor',
                 [r".*: warning: Supported source version .+ from annotation processor"]),
 ]
diff --git a/tools/warn/make_warn_patterns.py b/tools/warn/make_warn_patterns.py
index dd6a1b0..4b20493 100644
--- a/tools/warn/make_warn_patterns.py
+++ b/tools/warn/make_warn_patterns.py
@@ -16,8 +16,8 @@
 """Warning patterns for build make tools."""
 
 # pylint:disable=relative-beyond-top-level
-from .cpp_warn_patterns import compile_patterns
 # pylint:disable=g-importing-member
+from .cpp_warn_patterns import compile_patterns
 from .severity import Severity
 
 warn_patterns = [
diff --git a/tools/warn/other_warn_patterns.py b/tools/warn/other_warn_patterns.py
index 1350936..318c3d4 100644
--- a/tools/warn/other_warn_patterns.py
+++ b/tools/warn/other_warn_patterns.py
@@ -16,8 +16,8 @@
 """Warning patterns from other tools."""
 
 # pylint:disable=relative-beyond-top-level
-from .cpp_warn_patterns import compile_patterns
 # pylint:disable=g-importing-member
+from .cpp_warn_patterns import compile_patterns
 from .severity import Severity
 
 
@@ -42,14 +42,20 @@
   return warn('asm', Severity.MEDIUM, description, pattern_list)
 
 
-def kotlin(description, pattern_list):
-  return warn('Kotlin', Severity.MEDIUM, description, pattern_list)
+def kotlin(description, pattern):
+  return warn('Kotlin', Severity.MEDIUM, description,
+              [r'.*\.kt:.*: warning: ' + pattern])
 
 
 def yacc(description, pattern_list):
   return warn('yacc', Severity.MEDIUM, description, pattern_list)
 
 
+def rust(severity, description, pattern):
+  return warn('Rust', severity, description,
+              [r'.*\.rs:.*: warning: ' + pattern])
+
+
 warn_patterns = [
     # pylint:disable=line-too-long,g-inconsistent-quotes
     # aapt warnings
@@ -109,26 +115,31 @@
      'description': 'Proto: Import not used',
      'patterns': [r".*: warning: Import .*/.*\.proto but not used.$"]},
     # Kotlin warnings
-    kotlin('never used parameter or variable',
-           [r".*\.kt:.*: warning: (parameter|variable) '.*' is never used$",
-            r".*\.kt:.*: warning: (parameter|variable) '.*' is never used, could be renamed to _$"]),
-    kotlin('initializer is redundant',
-           [r".*\.kt:.*: warning: .* initializer is redundant$"]),
+    kotlin('never used parameter or variable', '.+ \'.*\' is never used'),
+    kotlin('multiple labels', '.+ more than one label .+ in this scope'),
+    kotlin('type mismatch', 'type mismatch: '),
+    kotlin('is always true', '.+ is always \'true\''),
+    kotlin('no effect', '.+ annotation has no effect for '),
+    kotlin('no cast needed', 'no cast needed'),
+    kotlin('accessor not generated', 'an accessor will not be generated '),
+    kotlin('initializer is redundant', '.* initializer is redundant$'),
     kotlin('elvis operator always returns ...',
-           [r".*\.kt:.*: warning: elvis operator \(\?:\) always returns .+"]),
-    kotlin('shadowed name',
-           [r".*\.kt:.*: warning: name shadowed: .+"]),
-    kotlin('unchecked cast',
-           [r".*\.kt:.*: warning: unchecked cast: .* to .*$"]),
+           'elvis operator (?:) always returns .+'),
+    kotlin('shadowed name', 'name shadowed: .+'),
+    kotlin('unchecked cast', 'unchecked cast: .* to .*$'),
+    kotlin('unreachable code', 'unreachable code'),
+    kotlin('unnecessary assertion', 'unnecessary .+ assertion .+'),
     kotlin('unnecessary safe call on a non-null receiver',
-           [r".*\.kt:.*: warning: unnecessary safe call on a non-null receiver"]),
+           'unnecessary safe call on a non-null receiver'),
     kotlin('Deprecated in Java',
-           [r".*\.kt:.*: warning: '.*' is deprecated. Deprecated in Java"]),
+           '\'.*\' is deprecated. Deprecated in Java'),
     kotlin('Replacing Handler for Executor',
-           [r".*\.kt:.*: warning: .+ Replacing Handler for Executor in "]),
+           '.+ Replacing Handler for Executor in '),
     kotlin('library has Kotlin runtime',
-           [r".*: warning: library has Kotlin runtime bundled into it",
-            r".*: warning: some JAR files .* have the Kotlin Runtime library"]),
+           '.+ has Kotlin runtime (bundled|library)'),
+    warn('Kotlin', Severity.MEDIUM, 'bundled Kotlin runtime',
+         ['.*warning: .+ (has|have the) Kotlin (runtime|Runtime library) bundled']),
+    kotlin('other warnings', '.+'),  # catch all other Kotlin warnings
     # Yacc warnings
     yacc('deprecate directive',
          [r".*\.yy?:.*: warning: deprecated directive: "]),
@@ -138,15 +149,20 @@
      'description': 'yacc: fix-its can be applied',
      'patterns': [r".*\.yy?: warning: fix-its can be applied."]},
     # Rust warnings
-    {'category': 'Rust', 'severity': Severity.HIGH,
-     'description': 'Rust: Does not derive Copy',
-     'patterns': [r".*: warning: .+ does not derive Copy"]},
-    {'category': 'Rust', 'severity': Severity.MEDIUM,
-     'description': 'Rust: Deprecated range pattern',
-     'patterns': [r".*: warning: .+ range patterns are deprecated"]},
-    {'category': 'Rust', 'severity': Severity.MEDIUM,
-     'description': 'Rust: Deprecated missing explicit \'dyn\'',
-     'patterns': [r".*: warning: .+ without an explicit `dyn` are deprecated"]},
+    rust(Severity.HIGH, 'Does not derive Copy', '.+ does not derive Copy'),
+    rust(Severity.MEDIUM, '... are deprecated',
+         ('(.+ are deprecated$|' +
+          'use of deprecated item .* (use .* instead|is now preferred))')),
+    rust(Severity.MEDIUM, 'never used', '.* is never used:'),
+    rust(Severity.MEDIUM, 'unused import', 'unused import: '),
+    rust(Severity.MEDIUM, 'unnecessary attribute',
+         '.+ no longer requires an attribute'),
+    rust(Severity.MEDIUM, 'unnecessary parentheses',
+         'unnecessary parentheses around'),
+    # Catch all RenderScript warnings
+    {'category': 'RenderScript', 'severity': Severity.LOW,
+     'description': 'RenderScript warnings',
+     'patterns': [r'.*\.rscript:.*: warning: ']},
     # Broken/partial warning messages will be skipped.
     {'category': 'Misc', 'severity': Severity.SKIP,
      'description': 'skip, ,',
diff --git a/tools/warn/severity.py b/tools/warn/severity.py
index b1c38e4..b4c03c9 100644
--- a/tools/warn/severity.py
+++ b/tools/warn/severity.py
@@ -20,24 +20,26 @@
 
 
 # pylint:disable=old-style-class
+class SeverityInfo:
+
+  def __init__(self, value, color, column_header, header):
+    self.value = value
+    self.color = color
+    self.column_header = column_header
+    self.header = header
+
+
+# pylint:disable=old-style-class
 class Severity:
   """Class of Severity levels where each level is a SeverityInfo."""
 
-  class SeverityInfo:
-
-    def __init__(self, value, color, column_header, header):
-      self.value = value
-      self.color = color
-      self.column_header = column_header
-      self.header = header
-
   # SEVERITY_UNKNOWN should never occur since every warn_pattern listed has
   # a specified severity. It exists for protobuf, the other values must
   # map to non-zero values (since 0 is reserved for a default UNKNOWN), but
   # logic in clang_tidy_warn.py assumes severity level values are consecutive
   # ints starting with 0.
-  SEVERITY_UNKNOWN = SeverityInfo(0, 'blueviolet', 'Errors of unknown severity',
-                                  'Unknown severity (should not occur)')
+  SEVERITY_UNKNOWN = SeverityInfo(0, 'blueviolet', 'Unknown',
+                                  'Unknown-severity warnings)')
   FIXMENOW = SeverityInfo(1, 'fuschia', 'FixNow',
                           'Critical warnings, fix me now')
   HIGH = SeverityInfo(2, 'red', 'High', 'High severity warnings')
diff --git a/tools/warn/tidy_warn_patterns.py b/tools/warn/tidy_warn_patterns.py
index 2c5ab79..5416cb2 100644
--- a/tools/warn/tidy_warn_patterns.py
+++ b/tools/warn/tidy_warn_patterns.py
@@ -16,8 +16,8 @@
 """Warning patterns for clang-tidy."""
 
 # pylint:disable=relative-beyond-top-level
-from .cpp_warn_patterns import compile_patterns
 # pylint:disable=g-importing-member
+from .cpp_warn_patterns import compile_patterns
 from .severity import Severity
 
 
@@ -78,6 +78,7 @@
     group_tidy_warn_pattern('android'),
     simple_tidy_warn_pattern('abseil-string-find-startswith'),
     simple_tidy_warn_pattern('bugprone-argument-comment'),
+    simple_tidy_warn_pattern('bugprone-branch-clone'),
     simple_tidy_warn_pattern('bugprone-copy-constructor-init'),
     simple_tidy_warn_pattern('bugprone-fold-init-type'),
     simple_tidy_warn_pattern('bugprone-forward-declaration-namespace'),
@@ -89,6 +90,9 @@
     simple_tidy_warn_pattern('bugprone-macro-parentheses'),
     simple_tidy_warn_pattern('bugprone-misplaced-widening-cast'),
     simple_tidy_warn_pattern('bugprone-move-forwarding-reference'),
+    simple_tidy_warn_pattern('bugprone-parent-virtual-call'),
+    simple_tidy_warn_pattern('bugprone-posix-return'),
+    simple_tidy_warn_pattern('bugprone-sizeof-container'),
     simple_tidy_warn_pattern('bugprone-sizeof-expression'),
     simple_tidy_warn_pattern('bugprone-string-constructor'),
     simple_tidy_warn_pattern('bugprone-string-integer-assignment'),
@@ -96,10 +100,25 @@
     simple_tidy_warn_pattern('bugprone-suspicious-missing-comma'),
     simple_tidy_warn_pattern('bugprone-suspicious-string-compare'),
     simple_tidy_warn_pattern('bugprone-suspicious-semicolon'),
+    simple_tidy_warn_pattern('bugprone-terminating-continue'),
+    simple_tidy_warn_pattern('bugprone-too-small-loop-variable'),
     simple_tidy_warn_pattern('bugprone-undefined-memory-manipulation'),
+    simple_tidy_warn_pattern('bugprone-unhandled-self-assignment'),
     simple_tidy_warn_pattern('bugprone-unused-raii'),
+    simple_tidy_warn_pattern('bugprone-unused-return-value'),
     simple_tidy_warn_pattern('bugprone-use-after-move'),
     group_tidy_warn_pattern('bugprone'),
+    simple_tidy_warn_pattern('cert-dcl16-c'),
+    simple_tidy_warn_pattern('cert-dcl21-cpp'),
+    simple_tidy_warn_pattern('cert-dcl50-cpp'),
+    simple_tidy_warn_pattern('cert-dcl54-cpp'),
+    simple_tidy_warn_pattern('cert-dcl59-cpp'),
+    simple_tidy_warn_pattern('cert-env33-c'),
+    simple_tidy_warn_pattern('cert-err34-c'),
+    simple_tidy_warn_pattern('cert-err52-cpp'),
+    simple_tidy_warn_pattern('cert-msc30-c'),
+    simple_tidy_warn_pattern('cert-msc50-cpp'),
+    simple_tidy_warn_pattern('cert-oop54-cpp'),
     group_tidy_warn_pattern('cert'),
     group_tidy_warn_pattern('clang-diagnostic'),
     group_tidy_warn_pattern('cppcoreguidelines'),
diff --git a/tools/warn/warn.py b/tools/warn/warn.py
index bdfd489..56e8787 100755
--- a/tools/warn/warn.py
+++ b/tools/warn/warn.py
@@ -17,21 +17,51 @@
 """Simple wrapper to run warn_common with Python standard Pool."""
 
 import multiprocessing
+import signal
+import sys
 
 # pylint:disable=relative-beyond-top-level
-# pylint:disable=g-importing-member
-from .warn_common import common_main
+from . import warn_common as common
 
 
-# This parallel_process could be changed depending on platform
-# and availability of multi-process library functions.
-def parallel_process(num_cpu, classify_warnings, groups):
+def classify_warnings(args):
+  """Classify a list of warning lines.
+
+  Args:
+    args: dictionary {
+        'group': list of (warning, link),
+        'project_patterns': re.compile(project_list[p][1]),
+        'warn_patterns': list of warn_pattern,
+        'num_processes': number of processes being used for multiprocessing }
+  Returns:
+    results: a list of the classified warnings.
+  """
+  results = []
+  for line, link in args['group']:
+    common.classify_one_warning(line, link, results, args['project_patterns'],
+                                args['warn_patterns'])
+
+  # After the main work, ignore all other signals to a child process,
+  # to avoid bad warning/error messages from the exit clean-up process.
+  if args['num_processes'] > 1:
+    signal.signal(signal.SIGTERM, lambda *args: sys.exit(-signal.SIGTERM))
+  return results
+
+
+def create_and_launch_subprocesses(num_cpu, classify_warnings_fn, arg_groups,
+                                   group_results):
   pool = multiprocessing.Pool(num_cpu)
-  return pool.map(classify_warnings, groups)
+  for cpu in range(num_cpu):
+    proc_result = pool.map(classify_warnings_fn, arg_groups[cpu])
+    if proc_result is not None:
+      group_results.append(proc_result)
+  return group_results
 
 
 def main():
-  common_main(parallel_process)
+  use_google3 = False
+  common.common_main(use_google3, create_and_launch_subprocesses,
+                     classify_warnings)
 
 
 if __name__ == '__main__':
diff --git a/tools/warn/warn_common.py b/tools/warn/warn_common.py
index 0c9d9ef..68ed995 100755
--- a/tools/warn/warn_common.py
+++ b/tools/warn/warn_common.py
@@ -18,6 +18,8 @@
 Default is to output warnings in HTML tables grouped by warning severity.
 Use option --byproject to output tables grouped by source file projects.
 Use option --gencsv to output warning counts in CSV format.
+
+Default input file is build.log, which can be changed with the --log flag.
 """
 
 # List of important data structures and functions in this script.
@@ -36,431 +38,203 @@
 #   project_patterns[p]              re.compile(project_list[p][1])
 #   project_names[p]                 project_list[p][0]
 #   warning_messages     array of each warning message, without source url
+#   warning_links        array of each warning code search link; for 'chrome'
 #   warning_records      array of [idx to warn_patterns,
 #                                  idx to project_names,
-#                                  idx to warning_messages]
-#   android_root
-#   platform_version
-#   target_product
-#   target_variant
+#                                  idx to warning_messages,
+#                                  idx to warning_links]
 #   parse_input_file
 #
-# To emit html page of warning messages:
-#   flags: --byproject, --url, --separator
-# Old stuff for static html components:
-#   html_script_style:  static html scripts and styles
-#   htmlbig:
-#   dump_stats, dump_html_prologue, dump_html_epilogue:
-#   emit_buttons:
-#   dump_fixed
-#   sort_warnings:
-#   emit_stats_by_project:
-#   all_patterns,
-#   findproject, classify_warning
-#   dump_html
-#
-# New dynamic HTML page's static JavaScript data:
-#   Some data are copied from Python to JavaScript, to generate HTML elements.
-#   FlagURL                args.url
-#   FlagSeparator          args.separator
-#   SeverityColors:        list of colors for all severity levels
-#   SeverityHeaders:       list of headers for all severity levels
-#   SeverityColumnHeaders: list of column_headers for all severity levels
-#   ProjectNames:          project_names, or project_list[*][0]
-#   WarnPatternsSeverity:     warn_patterns[*]['severity']
-#   WarnPatternsDescription:  warn_patterns[*]['description']
-#   WarningMessages:          warning_messages
-#   Warnings:                 warning_records
-#   StatsHeader:           warning count table header row
-#   StatsRows:             array of warning count table rows
-#
-# New dynamic HTML page's dynamic JavaScript data:
-#
-# New dynamic HTML related function to emit data:
-#   escape_string, strip_escape_string, emit_warning_arrays
-#   emit_js_data():
-
-from __future__ import print_function
 import argparse
-import cgi
-import csv
 import io
 import multiprocessing
 import os
 import re
-import signal
 import sys
 
 # pylint:disable=relative-beyond-top-level
-from . import cpp_warn_patterns
-from . import java_warn_patterns
-from . import make_warn_patterns
-from . import other_warn_patterns
-from . import tidy_warn_patterns
 # pylint:disable=g-importing-member
-from .android_project_list import project_list
-from .severity import Severity
-
-parser = argparse.ArgumentParser(description='Convert a build log into HTML')
-parser.add_argument('--csvpath',
-                    help='Save CSV warning file to the passed absolute path',
-                    default=None)
-parser.add_argument('--gencsv',
-                    help='Generate a CSV file with number of various warnings',
-                    action='store_true',
-                    default=False)
-parser.add_argument('--byproject',
-                    help='Separate warnings in HTML output by project names',
-                    action='store_true',
-                    default=False)
-parser.add_argument('--url',
-                    help='Root URL of an Android source code tree prefixed '
-                    'before files in warnings')
-parser.add_argument('--separator',
-                    help='Separator between the end of a URL and the line '
-                    'number argument. e.g. #')
-parser.add_argument('--processes',
-                    type=int,
-                    default=multiprocessing.cpu_count(),
-                    help='Number of parallel processes to process warnings')
-parser.add_argument(dest='buildlog', metavar='build.log',
-                    help='Path to build.log file')
-args = parser.parse_args()
-
-warn_patterns = make_warn_patterns.warn_patterns
-warn_patterns.extend(cpp_warn_patterns.warn_patterns)
-warn_patterns.extend(java_warn_patterns.warn_patterns)
-warn_patterns.extend(tidy_warn_patterns.warn_patterns)
-warn_patterns.extend(other_warn_patterns.warn_patterns)
-
-project_patterns = []
-project_names = []
-warning_messages = []
-warning_records = []
+from . import android_project_list
+from . import chrome_project_list
+from . import cpp_warn_patterns as cpp_patterns
+from . import html_writer
+from . import java_warn_patterns as java_patterns
+from . import make_warn_patterns as make_patterns
+from . import other_warn_patterns as other_patterns
+from . import tidy_warn_patterns as tidy_patterns
 
 
-def initialize_arrays():
-  """Complete global arrays before they are used."""
-  global project_names, project_patterns
-  project_names = [p[0] for p in project_list]
-  project_patterns = [re.compile(p[1]) for p in project_list]
-  for w in warn_patterns:
-    w['members'] = []
-    # Each warning pattern has a 'projects' dictionary, that
-    # maps a project name to number of warnings in that project.
-    w['projects'] = {}
+def parse_args(use_google3):
+  """Define and parse the args. Return the parse_args() result."""
+  parser = argparse.ArgumentParser(
+      description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter)
+  parser.add_argument('--capacitor_path', default='',
+                      help='Save capacitor warning file to the passed absolute'
+                      ' path')
+  # csvpath has a different naming than the above path because historically the
+  # original Android script used csvpath, so other scripts rely on it
+  parser.add_argument('--csvpath', default='',
+                      help='Save CSV warning file to the passed path')
+  parser.add_argument('--gencsv', action='store_true',
+                      help='Generate CSV file with number of various warnings')
+  parser.add_argument('--byproject', action='store_true',
+                      help='Separate warnings in HTML output by project names')
+  parser.add_argument('--url', default='',
+                      help='Root URL of an Android source code tree prefixed '
+                      'before files in warnings')
+  parser.add_argument('--separator', default='?l=',
+                      help='Separator between the end of a URL and the line '
+                      'number argument. e.g. #')
+  parser.add_argument('--processes', default=multiprocessing.cpu_count(),
+                      type=int,
+                      help='Number of parallel processes to process warnings')
+  # Old Android build scripts call warn.py without --platform,
+  # so the default platform is set to 'android'.
+  parser.add_argument('--platform', default='android',
+                      choices=['chrome', 'android'],
+                      help='Platform of the build log')
+  # Old Android build scripts call warn.py with only a build.log file path.
+  parser.add_argument('--log', help='Path to build log file')
+  parser.add_argument(dest='buildlog', metavar='build.log',
+                      default='build.log', nargs='?',
+                      help='Path to build.log file')
+  flags = parser.parse_args()
+  if not flags.log:
+    flags.log = flags.buildlog
+  if not use_google3 and not os.path.exists(flags.log):
+    sys.exit('Cannot find log file: ' + flags.log)
+  return flags
 
 
-initialize_arrays()
+def get_project_names(project_list):
+  """Get project_names from project_list."""
+  return [p[0] for p in project_list]
 
 
-android_root = ''
-platform_version = 'unknown'
-target_product = 'unknown'
-target_variant = 'unknown'
-
-
-##### Data and functions to dump html file. ##################################
-
-html_head_scripts = """\
-  <script type="text/javascript">
-  function expand(id) {
-    var e = document.getElementById(id);
-    var f = document.getElementById(id + "_mark");
-    if (e.style.display == 'block') {
-       e.style.display = 'none';
-       f.innerHTML = '&#x2295';
-    }
-    else {
-       e.style.display = 'block';
-       f.innerHTML = '&#x2296';
-    }
-  };
-  function expandCollapse(show) {
-    for (var id = 1; ; id++) {
-      var e = document.getElementById(id + "");
-      var f = document.getElementById(id + "_mark");
-      if (!e || !f) break;
-      e.style.display = (show ? 'block' : 'none');
-      f.innerHTML = (show ? '&#x2296' : '&#x2295');
-    }
-  };
-  </script>
-  <style type="text/css">
-  th,td{border-collapse:collapse; border:1px solid black;}
-  .button{color:blue;font-size:110%;font-weight:bolder;}
-  .bt{color:black;background-color:transparent;border:none;outline:none;
-      font-size:140%;font-weight:bolder;}
-  .c0{background-color:#e0e0e0;}
-  .c1{background-color:#d0d0d0;}
-  .t1{border-collapse:collapse; width:100%; border:1px solid black;}
-  </style>
-  <script src="https://www.gstatic.com/charts/loader.js"></script>
-"""
-
-
-def make_writer(output_stream):
-
-  def writer(text):
-    return output_stream.write(text + '\n')
-
-  return writer
-
-
-def html_big(param):
-  return '<font size="+2">' + param + '</font>'
-
-
-def dump_html_prologue(title, writer):
-  writer('<html>\n<head>')
-  writer('<title>' + title + '</title>')
-  writer(html_head_scripts)
-  emit_stats_by_project(writer)
-  writer('</head>\n<body>')
-  writer(html_big(title))
-  writer('<p>')
-
-
-def dump_html_epilogue(writer):
-  writer('</body>\n</head>\n</html>')
-
-
-def sort_warnings():
-  for i in warn_patterns:
-    i['members'] = sorted(set(i['members']))
-
-
-def emit_stats_by_project(writer):
-  """Dump a google chart table of warnings per project and severity."""
-  # warnings[p][s] is number of warnings in project p of severity s.
-  # pylint:disable=g-complex-comprehension
-  warnings = {p: {s.value: 0 for s in Severity.levels} for p in project_names}
-  for i in warn_patterns:
-    # pytype: disable=attribute-error
-    s = i['severity'].value
-    # pytype: enable=attribute-error
-    for p in i['projects']:
-      warnings[p][s] += i['projects'][p]
-
-  # total_by_project[p] is number of warnings in project p.
-  total_by_project = {
-      p: sum(warnings[p][s.value] for s in Severity.levels)
-      for p in project_names
-  }
-
-  # total_by_severity[s] is number of warnings of severity s.
-  total_by_severity = {
-      s.value: sum(warnings[p][s.value] for p in project_names)
-      for s in Severity.levels
-  }
-
-  # emit table header
-  stats_header = ['Project']
-  for s in Severity.levels:
-    if total_by_severity[s.value]:
-      stats_header.append(
-          '<span style=\'background-color:{}\'>{}</span>'.format(
-              s.color, s.column_header))
-  stats_header.append('TOTAL')
-
-  # emit a row of warning counts per project, skip no-warning projects
-  total_all_projects = 0
-  stats_rows = []
-  for p in project_names:
-    if total_by_project[p]:
-      one_row = [p]
-      for s in Severity.levels:
-        if total_by_severity[s.value]:
-          one_row.append(warnings[p][s.value])
-      one_row.append(total_by_project[p])
-      stats_rows.append(one_row)
-      total_all_projects += total_by_project[p]
-
-  # emit a row of warning counts per severity
-  total_all_severities = 0
-  one_row = ['<b>TOTAL</b>']
-  for s in Severity.levels:
-    if total_by_severity[s.value]:
-      one_row.append(total_by_severity[s.value])
-      total_all_severities += total_by_severity[s.value]
-  one_row.append(total_all_projects)
-  stats_rows.append(one_row)
-  writer('<script>')
-  emit_const_string_array('StatsHeader', stats_header, writer)
-  emit_const_object_array('StatsRows', stats_rows, writer)
-  writer(draw_table_javascript)
-  writer('</script>')
-
-
-def dump_stats(writer):
-  """Dump some stats about total number of warnings and such."""
-  known = 0
-  skipped = 0
-  unknown = 0
-  sort_warnings()
-  for i in warn_patterns:
-    if i['severity'] == Severity.UNMATCHED:
-      unknown += len(i['members'])
-    elif i['severity'] == Severity.SKIP:
-      skipped += len(i['members'])
-    else:
-      known += len(i['members'])
-  writer('Number of classified warnings: <b>' + str(known) + '</b><br>')
-  writer('Number of skipped warnings: <b>' + str(skipped) + '</b><br>')
-  writer('Number of unclassified warnings: <b>' + str(unknown) + '</b><br>')
-  total = unknown + known + skipped
-  extra_msg = ''
-  if total < 1000:
-    extra_msg = ' (low count may indicate incremental build)'
-  writer('Total number of warnings: <b>' + str(total) + '</b>' + extra_msg)
-
-
-# New base table of warnings, [severity, warn_id, project, warning_message]
-# Need buttons to show warnings in different grouping options.
-# (1) Current, group by severity, id for each warning pattern
-#     sort by severity, warn_id, warning_message
-# (2) Current --byproject, group by severity,
-#     id for each warning pattern + project name
-#     sort by severity, warn_id, project, warning_message
-# (3) New, group by project + severity,
-#     id for each warning pattern
-#     sort by project, severity, warn_id, warning_message
-def emit_buttons(writer):
-  writer('<button class="button" onclick="expandCollapse(1);">'
-         'Expand all warnings</button>\n'
-         '<button class="button" onclick="expandCollapse(0);">'
-         'Collapse all warnings</button>\n'
-         '<button class="button" onclick="groupBySeverity();">'
-         'Group warnings by severity</button>\n'
-         '<button class="button" onclick="groupByProject();">'
-         'Group warnings by project</button><br>')
-
-
-def all_patterns(category):
-  patterns = ''
-  for i in category['patterns']:
-    patterns += i
-    patterns += ' / '
-  return patterns
-
-
-def dump_fixed(writer):
-  """Show which warnings no longer occur."""
-  anchor = 'fixed_warnings'
-  mark = anchor + '_mark'
-  writer('\n<br><p style="background-color:lightblue"><b>'
-         '<button id="' + mark + '" '
-         'class="bt" onclick="expand(\'' + anchor + '\');">'
-         '&#x2295</button> Fixed warnings. '
-         'No more occurrences. Please consider turning these into '
-         'errors if possible, before they are reintroduced in to the build'
-         ':</b></p>')
-  writer('<blockquote>')
-  fixed_patterns = []
-  for i in warn_patterns:
-    if not i['members']:
-      fixed_patterns.append(i['description'] + ' (' + all_patterns(i) + ')')
-  fixed_patterns = sorted(fixed_patterns)
-  writer('<div id="' + anchor + '" style="display:none;"><table>')
-  cur_row_class = 0
-  for text in fixed_patterns:
-    cur_row_class = 1 - cur_row_class
-    # remove last '\n'
-    t = text[:-1] if text[-1] == '\n' else text
-    writer('<tr><td class="c' + str(cur_row_class) + '">' + t + '</td></tr>')
-  writer('</table></div>')
-  writer('</blockquote>')
-
-
-def find_project_index(line):
-  for p in range(len(project_patterns)):
-    if project_patterns[p].match(line):
-      return p
+def find_project_index(line, project_patterns):
+  for i, p in enumerate(project_patterns):
+    if p.match(line):
+      return i
   return -1
 
 
-def classify_one_warning(line, results):
+def classify_one_warning(warning, link, results, project_patterns,
+                         warn_patterns):
   """Classify one warning line."""
-  for i in range(len(warn_patterns)):
-    w = warn_patterns[i]
+  for i, w in enumerate(warn_patterns):
     for cpat in w['compiled_patterns']:
-      # pytype: disable=attribute-error
-      if cpat.match(line):
-        p = find_project_index(line)
-        results.append([line, i, p])
+      if cpat.match(warning):
+        p = find_project_index(warning, project_patterns)
+        results.append([warning, link, i, p])
         return
       else:
         # If we end up here, there was a problem parsing the log
         # probably caused by 'make -j' mixing the output from
         # 2 or more concurrent compiles
         pass
-      # pytype: enable=attribute-error
 
 
-def classify_warnings(lines):
-  results = []
-  for line in lines:
-    classify_one_warning(line, results)
-  # After the main work, ignore all other signals to a child process,
-  # to avoid bad warning/error messages from the exit clean-up process.
-  if args.processes > 1:
-    signal.signal(signal.SIGTERM, lambda *args: sys.exit(-signal.SIGTERM))
-  return results
+def remove_prefix(s, sub):
+  """Remove everything before last occurrence of substring sub in string s."""
+  if sub in s:
+    inc_sub = s.rfind(sub)
+    return s[inc_sub:]
+  return s
 
 
-def parallel_classify_warnings(warning_lines, parallel_process):
-  """Classify all warning lines with num_cpu parallel processes."""
-  num_cpu = args.processes
-  if num_cpu > 1:
-    groups = [[] for x in range(num_cpu)]
-    i = 0
-    for x in warning_lines:
-      groups[i].append(x)
-      i = (i + 1) % num_cpu
-    group_results = parallel_process(num_cpu, classify_warnings, groups)
-  else:
-    group_results = [classify_warnings(warning_lines)]
+# TODO(emmavukelj): Don't have any generate_*_cs_link functions call
+# normalize_path a second time (the first time being in parse_input_file)
+def generate_cs_link(warning_line, flags, android_root=None):
+  if flags.platform == 'chrome':
+    return generate_chrome_cs_link(warning_line, flags)
+  if flags.platform == 'android':
+    return generate_android_cs_link(warning_line, flags, android_root)
+  return 'https://cs.corp.google.com/'
 
-  for result in group_results:
-    for line, pattern_idx, project_idx in result:
-      pattern = warn_patterns[pattern_idx]
-      pattern['members'].append(line)
-      message_idx = len(warning_messages)
-      warning_messages.append(line)
-      warning_records.append([pattern_idx, project_idx, message_idx])
-      pname = '???' if project_idx < 0 else project_names[project_idx]
-      # Count warnings by project.
-      if pname in pattern['projects']:
-        pattern['projects'][pname] += 1
-      else:
-        pattern['projects'][pname] = 1
+
+def generate_android_cs_link(warning_line, flags, android_root):
+  """Generate the code search link for a warning line in Android."""
+  # max_splits=2 -> only 3 items
+  raw_path, line_number_str, _ = warning_line.split(':', 2)
+  normalized_path = normalize_path(raw_path, flags, android_root)
+  if not flags.url:
+    return normalized_path
+  link_path = flags.url + '/' + normalized_path
+  if line_number_str.isdigit():
+    link_path += flags.separator + line_number_str
+  return link_path
+
+
+def generate_chrome_cs_link(warning_line, flags):
+  """Generate the code search link for a warning line in Chrome."""
+  split_line = warning_line.split(':')
+  raw_path = split_line[0]
+  normalized_path = normalize_path(raw_path, flags)
+  link_base = 'https://cs.chromium.org/'
+  link_add = 'chromium'
+  link_path = None
+
+  # Basically just going through a few specific directory cases and specifying
+  # the proper behavior for that case. This list of cases was accumulated
+  # through trial and error manually going through the warnings.
+  #
+  # This code pattern of using case-specific "if"s instead of "elif"s looks
+  # possibly accidental and mistaken but it is intentional because some paths
+  # fall under several cases (e.g. third_party/lib/nghttp2_frame.c) and for
+  # those we want the most specific case to be applied. If there is reliable
+  # knowledge of exactly where these occur, this could be changed to "elif"s
+  # but there is no reliable set of paths falling under multiple cases at the
+  # moment.
+  if '/src/third_party' in raw_path:
+    link_path = remove_prefix(raw_path, '/src/third_party/')
+  if '/chrome_root/src_internal/' in raw_path:
+    link_path = remove_prefix(raw_path, '/chrome_root/src_internal/')
+    link_path = link_path[len('/chrome_root'):]  # remove chrome_root
+  if '/chrome_root/src/' in raw_path:
+    link_path = remove_prefix(raw_path, '/chrome_root/src/')
+    link_path = link_path[len('/chrome_root'):]  # remove chrome_root
+  if '/libassistant/' in raw_path:
+    link_add = 'eureka_internal/chromium/src'
+    link_base = 'https://cs.corp.google.com/'  # internal data
+    link_path = remove_prefix(normalized_path, '/libassistant/')
+  if raw_path.startswith('gen/'):
+    link_path = '/src/out/Debug/gen/' + normalized_path
+  if '/gen/' in raw_path:
+    return '%s?q=file:%s' % (link_base, remove_prefix(normalized_path, '/gen/'))
+
+  if not link_path and (raw_path.startswith('src/') or
+                        raw_path.startswith('src_internal/')):
+    link_path = '/%s' % raw_path
+
+  if not link_path:  # can't find specific link, send a query
+    return '%s?q=file:%s' % (link_base, normalized_path)
+
+  line_number = int(split_line[1])
+  link = '%s%s%s?l=%d' % (link_base, link_add, link_path, line_number)
+  return link
 
 
 def find_warn_py_and_android_root(path):
-  """Set and return android_root path if it is found."""
-  global android_root
+  """Return android source root path if warn.py is found."""
   parts = path.split('/')
   for idx in reversed(range(2, len(parts))):
     root_path = '/'.join(parts[:idx])
     # Android root directory should contain this script.
     if os.path.exists(root_path + '/build/make/tools/warn.py'):
-      android_root = root_path
-      return True
-  return False
+      return root_path
+  return ''
 
 
-def find_android_root():
-  """Guess android_root from common prefix of file paths."""
+def find_android_root(buildlog):
+  """Guess android source root from common prefix of file paths."""
   # Use the longest common prefix of the absolute file paths
   # of the first 10000 warning messages as the android_root.
-  global android_root
-  warning_lines = set()
+  warning_lines = []
   warning_pattern = re.compile('^/[^ ]*/[^ ]*: warning: .*')
   count = 0
-  infile = io.open(args.buildlog, mode='r', encoding='utf-8')
-  for line in infile:
+  for line in buildlog:
     if warning_pattern.match(line):
-      warning_lines.add(line)
+      warning_lines.append(line)
       count += 1
       if count > 9999:
         break
@@ -468,56 +242,110 @@
       # the source tree root.
       if count < 100:
         path = os.path.normpath(re.sub(':.*$', '', line))
-        if find_warn_py_and_android_root(path):
-          return
+        android_root = find_warn_py_and_android_root(path)
+        if android_root:
+          return android_root
   # Do not use common prefix of a small number of paths.
   if count > 10:
     # pytype: disable=wrong-arg-types
     root_path = os.path.commonprefix(warning_lines)
     # pytype: enable=wrong-arg-types
     if len(root_path) > 2 and root_path[len(root_path) - 1] == '/':
-      android_root = root_path[:-1]
+      return root_path[:-1]
+  return ''
 
 
-def remove_android_root_prefix(path):
+def remove_android_root_prefix(path, android_root):
   """Remove android_root prefix from path if it is found."""
   if path.startswith(android_root):
     return path[1 + len(android_root):]
+  return path
+
+
+def normalize_path(path, flags, android_root=None):
+  """Normalize file path relative to src/ or src-internal/ directory."""
+  path = os.path.normpath(path)
+
+  if flags.platform == 'android':
+    if android_root:
+      return remove_android_root_prefix(path, android_root)
+    return path
+
+  # Remove known prefix of root path and normalize the suffix.
+  idx = path.find('chrome_root/')
+  if idx >= 0:
+    # remove chrome_root/, we want path relative to that
+    return path[idx + len('chrome_root/'):]
   else:
     return path
 
 
-def normalize_path(path):
-  """Normalize file path relative to android_root."""
-  # If path is not an absolute path, just normalize it.
-  path = os.path.normpath(path)
-  # Remove known prefix of root path and normalize the suffix.
-  if path[0] == '/' and android_root:
-    return remove_android_root_prefix(path)
-  return path
-
-
-def normalize_warning_line(line):
-  """Normalize file path relative to android_root in a warning line."""
-  # replace fancy quotes with plain ol' quotes
+def normalize_warning_line(line, flags, android_root=None):
+  """Normalize file path relative to src directory in a warning line."""
   line = re.sub(u'[\u2018\u2019]', '\'', line)
   # replace non-ASCII chars to spaces
   line = re.sub(u'[^\x00-\x7f]', ' ', line)
   line = line.strip()
   first_column = line.find(':')
-  if first_column > 0:
-    return normalize_path(line[:first_column]) + line[first_column:]
-  else:
-    return line
+  return normalize_path(line[:first_column], flags,
+                        android_root) + line[first_column:]
 
 
-def parse_input_file(infile):
-  """Parse input file, collect parameters and warning lines."""
-  global android_root
-  global platform_version
-  global target_product
-  global target_variant
-  line_counter = 0
+def parse_input_file_chrome(infile, flags):
+  """Parse Chrome input file, collect parameters and warning lines."""
+  platform_version = 'unknown'
+  board_name = 'unknown'
+  architecture = 'unknown'
+
+  # only handle warning lines of format 'file_path:line_no:col_no: warning: ...'
+  chrome_warning_pattern = r'^[^ ]*/[^ ]*:[0-9]+:[0-9]+: warning: .*'
+
+  warning_pattern = re.compile(chrome_warning_pattern)
+
+  # Collect all unique warning lines
+  # Remove the duplicated warnings save ~8% of time when parsing
+  # one typical build log than before
+  unique_warnings = dict()
+  for line in infile:
+    if warning_pattern.match(line):
+      normalized_line = normalize_warning_line(line, flags)
+      if normalized_line not in unique_warnings:
+        unique_warnings[normalized_line] = generate_cs_link(line, flags)
+    elif (platform_version == 'unknown' or board_name == 'unknown' or
+          architecture == 'unknown'):
+      m = re.match(r'.+Package:.+chromeos-base/chromeos-chrome-', line)
+      if m is not None:
+        platform_version = 'R' + line.split('chrome-')[1].split('_')[0]
+        continue
+      m = re.match(r'.+Source\sunpacked\sin\s(.+)', line)
+      if m is not None:
+        board_name = m.group(1).split('/')[2]
+        continue
+      m = re.match(r'.+USE:\s*([^\s]*).*', line)
+      if m is not None:
+        architecture = m.group(1)
+        continue
+
+  header_str = '%s - %s - %s' % (platform_version, board_name, architecture)
+  return unique_warnings, header_str
+
+
+def add_normalized_line_to_warnings(line, flags, android_root, unique_warnings):
+  """Parse/normalize path, updating warning line and add to warnings dict."""
+  normalized_line = normalize_warning_line(line, flags, android_root)
+  if normalized_line not in unique_warnings:
+    unique_warnings[normalized_line] = generate_cs_link(line, flags,
+                                                        android_root)
+  return unique_warnings
+
+
+def parse_input_file_android(infile, flags):
+  """Parse Android input file, collect parameters and warning lines."""
+  platform_version = 'unknown'
+  target_product = 'unknown'
+  target_variant = 'unknown'
+  android_root = find_android_root(infile)
+  infile.seek(0)
 
   # rustc warning messages have two lines that should be combined:
   #     warning: description
@@ -532,20 +360,25 @@
   warning_without_file = re.compile('^warning: .*')
   rustc_file_position = re.compile('^[ ]+--> [^ ]*/[^ ]*:[0-9]+:[0-9]+')
 
-  # Collect all warnings into the warning_lines set.
-  warning_lines = set()
+   # Collect all unique warning lines
+  # Remove the duplicated warnings save ~8% of time when parsing
+  # one typical build log than before
+  unique_warnings = dict()
+  line_counter = 0
   prev_warning = ''
   for line in infile:
     if prev_warning:
       if rustc_file_position.match(line):
         # must be a rustc warning, combine 2 lines into one warning
         line = line.strip().replace('--> ', '') + ': ' + prev_warning
-        warning_lines.add(normalize_warning_line(line))
+        unique_warnings = add_normalized_line_to_warnings(
+            line, flags, android_root, unique_warnings)
         prev_warning = ''
         continue
       # add prev_warning, and then process the current line
       prev_warning = 'unknown_source_file: ' + prev_warning
-      warning_lines.add(normalize_warning_line(prev_warning))
+      unique_warnings = add_normalized_line_to_warnings(
+          prev_warning, flags, android_root, unique_warnings)
       prev_warning = ''
 
     if warning_pattern.match(line):
@@ -553,7 +386,8 @@
         # save this line and combine it with the next line
         prev_warning = line
       else:
-        warning_lines.add(normalize_warning_line(line))
+        unique_warnings = add_normalized_line_to_warnings(
+            line, flags, android_root, unique_warnings)
       continue
 
     if line_counter < 100:
@@ -568,336 +402,182 @@
       m = re.search('(?<=^TARGET_BUILD_VARIANT=).*', line)
       if m is not None:
         target_variant = m.group(0)
-      m = re.search('.* TOP=([^ ]*) .*', line)
+      m = re.search('(?<=^TOP=).*', line)
       if m is not None:
         android_root = m.group(1)
-  return warning_lines
+
+  if android_root:
+    new_unique_warnings = dict()
+    for warning_line in unique_warnings:
+      normalized_line = normalize_warning_line(warning_line, flags,
+                                               android_root)
+      new_unique_warnings[normalized_line] = generate_android_cs_link(
+          warning_line, flags, android_root)
+    unique_warnings = new_unique_warnings
+
+  header_str = '%s - %s - %s' % (platform_version, target_product,
+                                 target_variant)
+  return unique_warnings, header_str
 
 
-# Return s with escaped backslash and quotation characters.
-def escape_string(s):
-  # pytype: disable=attribute-error
-  return s.replace('\\', '\\\\').replace('"', '\\"')
-  # pytype: enable=attribute-error
+def parse_input_file(infile, flags):
+  if flags.platform == 'chrome':
+    return parse_input_file_chrome(infile, flags)
+  if flags.platform == 'android':
+    return parse_input_file_android(infile, flags)
+  raise RuntimeError('parse_input_file not defined for platform %s' %
+                     flags.platform)
 
 
-# Return s without trailing '\n' and escape the quotation characters.
-def strip_escape_string(s):
-  if not s:
-    return s
-  s = s[:-1] if s[-1] == '\n' else s
-  return escape_string(s)
+def parse_compiler_output(compiler_output):
+  """Parse compiler output for relevant info."""
+  split_output = compiler_output.split(':', 3)  # 3 = max splits
+  file_path = split_output[0]
+  line_number = int(split_output[1])
+  col_number = int(split_output[2].split(' ')[0])
+  warning_message = split_output[3]
+  return file_path, line_number, col_number, warning_message
 
 
-def emit_warning_array(name, writer):
-  writer('var warning_{} = ['.format(name))
-  for i in range(len(warn_patterns)):
-    writer('{},'.format(warn_patterns[i][name]))
-  writer('];')
-
-
-def emit_warning_arrays(writer):
-  emit_warning_array('severity', writer)
-  writer('var warning_description = [')
-  for i in range(len(warn_patterns)):
-    if warn_patterns[i]['members']:
-      writer('"{}",'.format(escape_string(warn_patterns[i]['description'])))
-    else:
-      writer('"",')  # no such warning
-  writer('];')
-
-
-scripts_for_warning_groups = """
-  function compareMessages(x1, x2) { // of the same warning type
-    return (WarningMessages[x1[2]] <= WarningMessages[x2[2]]) ? -1 : 1;
-  }
-  function byMessageCount(x1, x2) {
-    return x2[2] - x1[2];  // reversed order
-  }
-  function bySeverityMessageCount(x1, x2) {
-    // orer by severity first
-    if (x1[1] != x2[1])
-      return  x1[1] - x2[1];
-    return byMessageCount(x1, x2);
-  }
-  const ParseLinePattern = /^([^ :]+):(\\d+):(.+)/;
-  function addURL(line) {
-    if (FlagURL == "") return line;
-    if (FlagSeparator == "") {
-      return line.replace(ParseLinePattern,
-        "<a target='_blank' href='" + FlagURL + "/$1'>$1</a>:$2:$3");
-    }
-    return line.replace(ParseLinePattern,
-      "<a target='_blank' href='" + FlagURL + "/$1" + FlagSeparator +
-        "$2'>$1:$2</a>:$3");
-  }
-  function createArrayOfDictionaries(n) {
-    var result = [];
-    for (var i=0; i<n; i++) result.push({});
-    return result;
-  }
-  function groupWarningsBySeverity() {
-    // groups is an array of dictionaries,
-    // each dictionary maps from warning type to array of warning messages.
-    var groups = createArrayOfDictionaries(SeverityColors.length);
-    for (var i=0; i<Warnings.length; i++) {
-      var w = Warnings[i][0];
-      var s = WarnPatternsSeverity[w];
-      var k = w.toString();
-      if (!(k in groups[s]))
-        groups[s][k] = [];
-      groups[s][k].push(Warnings[i]);
-    }
-    return groups;
-  }
-  function groupWarningsByProject() {
-    var groups = createArrayOfDictionaries(ProjectNames.length);
-    for (var i=0; i<Warnings.length; i++) {
-      var w = Warnings[i][0];
-      var p = Warnings[i][1];
-      var k = w.toString();
-      if (!(k in groups[p]))
-        groups[p][k] = [];
-      groups[p][k].push(Warnings[i]);
-    }
-    return groups;
-  }
-  var GlobalAnchor = 0;
-  function createWarningSection(header, color, group) {
-    var result = "";
-    var groupKeys = [];
-    var totalMessages = 0;
-    for (var k in group) {
-       totalMessages += group[k].length;
-       groupKeys.push([k, WarnPatternsSeverity[parseInt(k)], group[k].length]);
-    }
-    groupKeys.sort(bySeverityMessageCount);
-    for (var idx=0; idx<groupKeys.length; idx++) {
-      var k = groupKeys[idx][0];
-      var messages = group[k];
-      var w = parseInt(k);
-      var wcolor = SeverityColors[WarnPatternsSeverity[w]];
-      var description = WarnPatternsDescription[w];
-      if (description.length == 0)
-          description = "???";
-      GlobalAnchor += 1;
-      result += "<table class='t1'><tr bgcolor='" + wcolor + "'><td>" +
-                "<button class='bt' id='" + GlobalAnchor + "_mark" +
-                "' onclick='expand(\\"" + GlobalAnchor + "\\");'>" +
-                "&#x2295</button> " +
-                description + " (" + messages.length + ")</td></tr></table>";
-      result += "<div id='" + GlobalAnchor +
-                "' style='display:none;'><table class='t1'>";
-      var c = 0;
-      messages.sort(compareMessages);
-      for (var i=0; i<messages.length; i++) {
-        result += "<tr><td class='c" + c + "'>" +
-                  addURL(WarningMessages[messages[i][2]]) + "</td></tr>";
-        c = 1 - c;
-      }
-      result += "</table></div>";
-    }
-    if (result.length > 0) {
-      return "<br><span style='background-color:" + color + "'><b>" +
-             header + ": " + totalMessages +
-             "</b></span><blockquote><table class='t1'>" +
-             result + "</table></blockquote>";
-
-    }
-    return "";  // empty section
-  }
-  function generateSectionsBySeverity() {
-    var result = "";
-    var groups = groupWarningsBySeverity();
-    for (s=0; s<SeverityColors.length; s++) {
-      result += createWarningSection(SeverityHeaders[s], SeverityColors[s],
-                                     groups[s]);
-    }
-    return result;
-  }
-  function generateSectionsByProject() {
-    var result = "";
-    var groups = groupWarningsByProject();
-    for (i=0; i<groups.length; i++) {
-      result += createWarningSection(ProjectNames[i], 'lightgrey', groups[i]);
-    }
-    return result;
-  }
-  function groupWarnings(generator) {
-    GlobalAnchor = 0;
-    var e = document.getElementById("warning_groups");
-    e.innerHTML = generator();
-  }
-  function groupBySeverity() {
-    groupWarnings(generateSectionsBySeverity);
-  }
-  function groupByProject() {
-    groupWarnings(generateSectionsByProject);
-  }
-"""
-
-
-# Emit a JavaScript const string
-def emit_const_string(name, value, writer):
-  writer('const ' + name + ' = "' + escape_string(value) + '";')
-
-
-# Emit a JavaScript const integer array.
-def emit_const_int_array(name, array, writer):
-  writer('const ' + name + ' = [')
-  for n in array:
-    writer(str(n) + ',')
-  writer('];')
-
-
-# Emit a JavaScript const string array.
-def emit_const_string_array(name, array, writer):
-  writer('const ' + name + ' = [')
-  for s in array:
-    writer('"' + strip_escape_string(s) + '",')
-  writer('];')
-
-
-# Emit a JavaScript const string array for HTML.
-def emit_const_html_string_array(name, array, writer):
-  writer('const ' + name + ' = [')
-  for s in array:
-    # Not using html.escape yet, to work for both python 2 and 3,
-    # until all users switch to python 3.
-    # pylint:disable=deprecated-method
-    writer('"' + cgi.escape(strip_escape_string(s)) + '",')
-  writer('];')
-
-
-# Emit a JavaScript const object array.
-def emit_const_object_array(name, array, writer):
-  writer('const ' + name + ' = [')
-  for x in array:
-    writer(str(x) + ',')
-  writer('];')
-
-
-def emit_js_data(writer):
-  """Dump dynamic HTML page's static JavaScript data."""
-  emit_const_string('FlagURL',
-                    args.url if args.url else '', writer)
-  emit_const_string('FlagSeparator',
-                    args.separator if args.separator else '', writer)
-  emit_const_string_array('SeverityColors',
-                          [s.color for s in Severity.levels], writer)
-  emit_const_string_array('SeverityHeaders',
-                          [s.header for s in Severity.levels], writer)
-  emit_const_string_array('SeverityColumnHeaders',
-                          [s.column_header for s in Severity.levels], writer)
-  emit_const_string_array('ProjectNames', project_names, writer)
-  # pytype: disable=attribute-error
-  emit_const_int_array('WarnPatternsSeverity',
-                       [w['severity'].value for w in warn_patterns], writer)
-  # pytype: enable=attribute-error
-  emit_const_html_string_array('WarnPatternsDescription',
-                               [w['description'] for w in warn_patterns],
-                               writer)
-  emit_const_html_string_array('WarningMessages', warning_messages, writer)
-  emit_const_object_array('Warnings', warning_records, writer)
-
-draw_table_javascript = """
-google.charts.load('current', {'packages':['table']});
-google.charts.setOnLoadCallback(drawTable);
-function drawTable() {
-  var data = new google.visualization.DataTable();
-  data.addColumn('string', StatsHeader[0]);
-  for (var i=1; i<StatsHeader.length; i++) {
-    data.addColumn('number', StatsHeader[i]);
-  }
-  data.addRows(StatsRows);
-  for (var i=0; i<StatsRows.length; i++) {
-    for (var j=0; j<StatsHeader.length; j++) {
-      data.setProperty(i, j, 'style', 'border:1px solid black;');
-    }
-  }
-  var table = new google.visualization.Table(
-      document.getElementById('stats_table'));
-  table.draw(data, {allowHtml: true, alternatingRowStyle: true});
-}
-"""
-
-
-def dump_html(output_stream):
-  """Dump the html output to output_stream."""
-  writer = make_writer(output_stream)
-  dump_html_prologue('Warnings for ' + platform_version + ' - ' +
-                     target_product + ' - ' + target_variant, writer)
-  dump_stats(writer)
-  writer('<br><div id="stats_table"></div><br>')
-  writer('\n<script>')
-  emit_js_data(writer)
-  writer(scripts_for_warning_groups)
-  writer('</script>')
-  emit_buttons(writer)
-  # Warning messages are grouped by severities or project names.
-  writer('<br><div id="warning_groups"></div>')
-  if args.byproject:
-    writer('<script>groupByProject();</script>')
+def get_warn_patterns(platform):
+  """Get and initialize warn_patterns."""
+  warn_patterns = []
+  if platform == 'chrome':
+    warn_patterns = cpp_patterns.warn_patterns
+  elif platform == 'android':
+    warn_patterns = make_patterns.warn_patterns + cpp_patterns.warn_patterns + java_patterns.warn_patterns + tidy_patterns.warn_patterns + other_patterns.warn_patterns
   else:
-    writer('<script>groupBySeverity();</script>')
-  dump_fixed(writer)
-  dump_html_epilogue(writer)
+    raise Exception('platform name %s is not valid' % platform)
+  for w in warn_patterns:
+    w['members'] = []
+    # Each warning pattern has a 'projects' dictionary, that
+    # maps a project name to number of warnings in that project.
+    w['projects'] = {}
+  return warn_patterns
 
 
-##### Functions to count warnings and dump csv file. #########################
+def get_project_list(platform):
+  """Return project list for appropriate platform."""
+  if platform == 'chrome':
+    return chrome_project_list.project_list
+  if platform == 'android':
+    return android_project_list.project_list
+  raise Exception('platform name %s is not valid' % platform)
 
 
-def description_for_csv(category):
-  if not category['description']:
-    return '?'
-  return category['description']
+def parallel_classify_warnings(warning_data, args, project_names,
+                               project_patterns, warn_patterns,
+                               use_google3, create_launch_subprocs_fn,
+                               classify_warnings_fn):
+  """Classify all warning lines with num_cpu parallel processes."""
+  num_cpu = args.processes
+  group_results = []
 
+  if num_cpu > 1:
+    # set up parallel processing for this...
+    warning_groups = [[] for _ in range(num_cpu)]
+    i = 0
+    for warning, link in warning_data.items():
+      warning_groups[i].append((warning, link))
+      i = (i + 1) % num_cpu
+    arg_groups = [[] for _ in range(num_cpu)]
+    for i, group in enumerate(warning_groups):
+      arg_groups[i] = [{
+          'group': group,
+          'project_patterns': project_patterns,
+          'warn_patterns': warn_patterns,
+          'num_processes': num_cpu
+      }]
 
-def count_severity(writer, sev, kind):
-  """Count warnings of given severity."""
-  total = 0
-  for i in warn_patterns:
-    if i['severity'] == sev and i['members']:
-      n = len(i['members'])
-      total += n
-      warning = kind + ': ' + description_for_csv(i)
-      writer.writerow([n, '', warning])
-      # print number of warnings for each project, ordered by project name.
-      # pytype: disable=attribute-error
-      projects = sorted(i['projects'].keys())
-      # pytype: enable=attribute-error
-      for p in projects:
-        writer.writerow([i['projects'][p], p, warning])
-  writer.writerow([total, '', kind + ' warnings'])
-
-  return total
-
-
-# dump number of warnings in csv format to stdout
-def dump_csv(writer):
-  """Dump number of warnings in csv format to stdout."""
-  sort_warnings()
-  total = 0
-  for s in Severity.levels:
-    if s != Severity.SEVERITY_UNKNOWN:
-      total += count_severity(writer, s, s.column_header)
-  writer.writerow([total, '', 'All warnings'])
-
-
-def common_main(parallel_process):
-  """Real main function to classify warnings and generate .html file."""
-  find_android_root()
-  # We must use 'utf-8' codec to parse some non-ASCII code in warnings.
-  warning_lines = parse_input_file(
-      io.open(args.buildlog, mode='r', encoding='utf-8'))
-  parallel_classify_warnings(warning_lines, parallel_process)
-  # If a user pases a csv path, save the fileoutput to the path
-  # If the user also passed gencsv write the output to stdout
-  # If the user did not pass gencsv flag dump the html report to stdout.
-  if args.csvpath:
-    with open(args.csvpath, 'w') as f:
-      dump_csv(csv.writer(f, lineterminator='\n'))
-  if args.gencsv:
-    dump_csv(csv.writer(sys.stdout, lineterminator='\n'))
+    group_results = create_launch_subprocs_fn(num_cpu,
+                                              classify_warnings_fn,
+                                              arg_groups,
+                                              group_results)
   else:
-    dump_html(sys.stdout)
+    group_results = []
+    for warning, link in warning_data.items():
+      classify_one_warning(warning, link, group_results,
+                           project_patterns, warn_patterns)
+    group_results = [group_results]
+
+  warning_messages = []
+  warning_links = []
+  warning_records = []
+  if use_google3:
+    group_results = [group_results]
+  for group_result in group_results:
+    for result in group_result:
+      for line, link, pattern_idx, project_idx in result:
+        pattern = warn_patterns[pattern_idx]
+        pattern['members'].append(line)
+        message_idx = len(warning_messages)
+        warning_messages.append(line)
+        link_idx = len(warning_links)
+        warning_links.append(link)
+        warning_records.append([pattern_idx, project_idx, message_idx,
+                                link_idx])
+        pname = '???' if project_idx < 0 else project_names[project_idx]
+        # Count warnings by project.
+        if pname in pattern['projects']:
+          pattern['projects'][pname] += 1
+        else:
+          pattern['projects'][pname] = 1
+  return warning_messages, warning_links, warning_records
+
+
+def process_log(logfile, flags, project_names, project_patterns, warn_patterns,
+                html_path, use_google3, create_launch_subprocs_fn,
+                classify_warnings_fn, logfile_object):
+  # pylint: disable=g-doc-args
+  # pylint: disable=g-doc-return-or-yield
+  """Function that handles processing of a log.
+
+  This is isolated into its own function (rather than just taking place in main)
+  so that it can be used by both warn.py and the borg job process_gs_logs.py, to
+  avoid duplication of code.
+  Note that if the arguments to this function change, process_gs_logs.py must
+  be updated accordingly.
+  """
+  if logfile_object is None:
+    with io.open(logfile, encoding='utf-8') as log:
+      warning_lines_and_links, header_str = parse_input_file(log, flags)
+  else:
+    warning_lines_and_links, header_str = parse_input_file(
+        logfile_object, flags)
+  warning_messages, warning_links, warning_records = parallel_classify_warnings(
+      warning_lines_and_links, flags, project_names, project_patterns,
+      warn_patterns, use_google3, create_launch_subprocs_fn,
+      classify_warnings_fn)
+
+  html_writer.write_html(flags, project_names, warn_patterns, html_path,
+                         warning_messages, warning_links, warning_records,
+                         header_str)
+
+  return warning_messages, warning_links, warning_records, header_str
+
+
+def common_main(use_google3, create_launch_subprocs_fn, classify_warnings_fn,
+                logfile_object=None):
+  """Shared main function for Google3 and non-Google3 versions of warn.py."""
+  flags = parse_args(use_google3)
+  warn_patterns = get_warn_patterns(flags.platform)
+  project_list = get_project_list(flags.platform)
+
+  project_names = get_project_names(project_list)
+  project_patterns = [re.compile(p[1]) for p in project_list]
+
+  # html_path=None because we output html below if not outputting CSV
+  warning_messages, warning_links, warning_records, header_str = process_log(
+      logfile=flags.log, flags=flags, project_names=project_names,
+      project_patterns=project_patterns, warn_patterns=warn_patterns,
+      html_path=None, use_google3=use_google3,
+      create_launch_subprocs_fn=create_launch_subprocs_fn,
+      classify_warnings_fn=classify_warnings_fn,
+      logfile_object=logfile_object)
+
+  html_writer.write_out_csv(flags, warn_patterns, warning_messages,
+                            warning_links, warning_records, header_str,
+                            project_names)
+
+  # Return these values, so that caller can use them, if desired.
+  return flags, warning_messages, warning_records, warn_patterns