diff --git a/core/build_id.mk b/core/build_id.mk
index 932e214..0e8e2cf 100644
--- a/core/build_id.mk
+++ b/core/build_id.mk
@@ -18,4 +18,4 @@
 # (like "CRB01").  It must be a single word, and is
 # capitalized by convention.
 
-export BUILD_ID=PI
+export BUILD_ID=MASTER
diff --git a/core/host_java_library.mk b/core/host_java_library.mk
index 32295ab..750254f 100644
--- a/core/host_java_library.mk
+++ b/core/host_java_library.mk
@@ -102,16 +102,10 @@
 	$(MERGE_ZIPS) -j --ignore-duplicates $(if $(PRIVATE_JAR_MANIFEST),-m $(dir $@)/manifest.mf) \
             -stripDir META-INF -zipToNotStrip $< $@ $< $(call reverse-list,$(PRIVATE_STATIC_JAVA_LIBRARIES))
 
-#######################################
-LOCAL_JETIFIER_INPUT_FILE := $(full_classes_combined_jar)
-
-include $(BUILD_SYSTEM)/jetifier.mk
-#######################################
-
 # Run jarjar if necessary, otherwise just copy the file.
 ifneq ($(strip $(LOCAL_JARJAR_RULES)),)
 $(full_classes_jarjar_jar): PRIVATE_JARJAR_RULES := $(LOCAL_JARJAR_RULES)
-$(full_classes_jarjar_jar): $(LOCAL_JETIFIER_OUTPUT_FILE) $(LOCAL_JARJAR_RULES) | $(JARJAR)
+$(full_classes_jarjar_jar): $(full_classes_combined_jar) $(LOCAL_JARJAR_RULES) | $(JARJAR)
 	@echo JarJar: $@
 	$(hide) $(JAVA) -jar $(JARJAR) process $(PRIVATE_JARJAR_RULES) $< $@
 else
diff --git a/core/java.mk b/core/java.mk
index 80bd5eb..0ad819d 100644
--- a/core/java.mk
+++ b/core/java.mk
@@ -362,13 +362,7 @@
 full_classes_jarjar_jar := $(full_classes_processed_jar)
 endif
 
-#######################################
-LOCAL_JETIFIER_INPUT_FILE := $(full_classes_jarjar_jar)
-
-include $(BUILD_SYSTEM)/jetifier.mk
-#######################################
-
-$(eval $(call copy-one-file,$(LOCAL_JETIFIER_OUTPUT_FILE),$(full_classes_jar)))
+$(eval $(call copy-one-file,$(full_classes_jarjar_jar),$(full_classes_jar)))
 
 #######################################
 LOCAL_FULL_CLASSES_PRE_JACOCO_JAR := $(full_classes_jar)
diff --git a/core/jetifier.mk b/core/jetifier.mk
index 305c9dd..6ec8158 100644
--- a/core/jetifier.mk
+++ b/core/jetifier.mk
@@ -20,11 +20,11 @@
 ifeq ($(strip $(LOCAL_JETIFIER_ENABLED)),true)
   my_jetifier_input_path := $(LOCAL_JETIFIER_INPUT_FILE)
   my_files := $(intermediates.COMMON)/jetifier
-  my_jetifier_output_path := $(my_files)/classes-jetifier.jar
+  my_jetifier_output_path := $(my_files)/jetified-$(notdir $(my_jetifier_input_path))
 
 $(my_jetifier_output_path) : $(my_jetifier_input_path) $(JETIFIER)
 	rm -rf $@
-	$(JETIFIER) -outputfile $@ -i $<
+	$(JETIFIER) -l error -outputfile $@ -i $<
 
   LOCAL_JETIFIER_OUTPUT_FILE := $(my_jetifier_output_path)
   LOCAL_INTERMEDIATE_TARGETS += $(LOCAL_JETIFIER_OUTPUT_FILE)
diff --git a/core/prebuilt_internal.mk b/core/prebuilt_internal.mk
index 96e2613..0efda57 100644
--- a/core/prebuilt_internal.mk
+++ b/core/prebuilt_internal.mk
@@ -571,6 +571,12 @@
 my_src_aar := $(filter %.aar, $(my_prebuilt_src_file))
 ifneq ($(my_src_aar),)
 # This is .aar file, archive of classes.jar and Android resources.
+
+# run Jetifier if needed
+LOCAL_JETIFIER_INPUT_FILE := $(my_src_aar)
+include $(BUILD_SYSTEM)/jetifier.mk
+my_src_aar := $(LOCAL_JETIFIER_OUTPUT_FILE)
+
 my_src_jar := $(intermediates.COMMON)/aar/classes.jar
 my_src_proguard_options := $(intermediates.COMMON)/aar/proguard.txt
 
@@ -582,6 +588,12 @@
 	$(hide) touch $@
 	# Make sure the proguard file exists and has a new timestamp.
 	$(hide) touch $(dir $@)/proguard.txt
+else
+
+# run Jetifier if needed
+LOCAL_JETIFIER_INPUT_FILE := $(my_src_jar)
+include $(BUILD_SYSTEM)/jetifier.mk
+my_src_jar := $(LOCAL_JETIFIER_OUTPUT_FILE)
 
 endif
 
diff --git a/core/sdk_check.mk b/core/sdk_check.mk
index 49ea2a8..c09fc7c 100644
--- a/core/sdk_check.mk
+++ b/core/sdk_check.mk
@@ -8,6 +8,11 @@
 
 whitelisted_modules := framework-res__auto_generated_rro
 
+
+ifeq (,$(JAVA_SDK_ENFORCEMENT_ERROR))
+  JAVA_SDK_ENFORCEMENT_ERROR := APPS
+endif
+
 ifeq ($(LOCAL_SDK_VERSION)$(LOCAL_PRIVATE_PLATFORM_APIS),)
   ifeq (,$(filter $(LOCAL_MODULE),$(whitelisted_modules)))
     ifneq ($(JAVA_SDK_ENFORCEMENT_WARNING)$(JAVA_SDK_ENFORCEMENT_ERROR),)
diff --git a/core/soong_config.mk b/core/soong_config.mk
index 02d221d..d899b32 100644
--- a/core/soong_config.mk
+++ b/core/soong_config.mk
@@ -124,6 +124,7 @@
 $(call add_json_bool, Enforce_vintf_manifest,            $(filter true,$(PRODUCT_ENFORCE_VINTF_MANIFEST)))
 
 $(call add_json_bool, Uml,                               $(filter true,$(TARGET_USER_MODE_LINUX)))
+$(call add_json_bool, Use_lmkd_stats_log,                $(filter true,$(TARGET_LMKD_STATS_LOG)))
 $(call add_json_str,  VendorPath,                        $(TARGET_COPY_OUT_VENDOR))
 $(call add_json_str,  OdmPath,                           $(TARGET_COPY_OUT_ODM))
 $(call add_json_str,  ProductPath,                       $(TARGET_COPY_OUT_PRODUCT))
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index d6bad21..0f33b83 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -39,9 +39,9 @@
   include $(INTERNAL_BUILD_ID_MAKEFILE)
 endif
 
-DEFAULT_PLATFORM_VERSION := PPR1
-MIN_PLATFORM_VERSION := PPR1
-MAX_PLATFORM_VERSION := PPR1
+DEFAULT_PLATFORM_VERSION := QPR1
+MIN_PLATFORM_VERSION := QPR1
+MAX_PLATFORM_VERSION := QPR1
 
 ALLOWED_VERSIONS := $(call allowed-platform-versions,\
   $(MIN_PLATFORM_VERSION),\
@@ -75,11 +75,20 @@
 # please add that PLATFORM_VERSION as well as clean up obsolete PLATFORM_VERSION's
 # in the following text file:
 # cts/tests/tests/os/assets/platform_versions.txt
+
+# Note that there should be one PLATFORM_VERSION and PLATFORM_VERSION_CODENAME
+# entry for each unreleased API level, regardless of
+# MIN_PLATFORM_VERSION/MAX_PLATFORM_VERSION. PLATFORM_VERSION is used to
+# generate the range of allowed SDK versions, so it must have an entry for every
+# unreleased API level targetable by this branch, not just those that are valid
+# lunch targets for this branch.
 PLATFORM_VERSION.PPR1 := P
+PLATFORM_VERSION.QPR1 := Q
 
 # These are the current development codenames, if the build is not a final
 # release build.  If this is a final release build, it is simply "REL".
 PLATFORM_VERSION_CODENAME.PPR1 := P
+PLATFORM_VERSION_CODENAME.QPR1 := Q
 
 ifndef PLATFORM_VERSION
   PLATFORM_VERSION := $(PLATFORM_VERSION.$(TARGET_PLATFORM_VERSION))
@@ -234,7 +243,7 @@
     #  It must be of the form "YYYY-MM-DD" on production devices.
     #  It must match one of the Android Security Patch Level strings of the Public Security Bulletins.
     #  If there is no $PLATFORM_SECURITY_PATCH set, keep it empty.
-      PLATFORM_SECURITY_PATCH := 2018-04-05
+      PLATFORM_SECURITY_PATCH := 2018-05-05
 endif
 
 ifndef PLATFORM_BASE_OS
diff --git a/target/product/aosp_x86_arm.mk b/target/product/aosp_x86_arm.mk
index 19f57e8..f93f740 100644
--- a/target/product/aosp_x86_arm.mk
+++ b/target/product/aosp_x86_arm.mk
@@ -34,6 +34,7 @@
   liblog_arm \
   libm_arm \
   libmediandk_arm \
+  libamidi_arm \
   libOpenMAXAL_arm \
   libstdc++_arm \
   libOpenSLES_arm \
diff --git a/target/product/core_minimal.mk b/target/product/core_minimal.mk
index 1849818..10d7979 100644
--- a/target/product/core_minimal.mk
+++ b/target/product/core_minimal.mk
@@ -63,6 +63,7 @@
     ld.config.txt \
     ld.mc \
     libaaudio \
+    libamidi \
     libOpenMAXAL \
     libOpenSLES \
     libdownmix \
diff --git a/target/product/core_tiny.mk b/target/product/core_tiny.mk
index ce45284..0beafda 100644
--- a/target/product/core_tiny.mk
+++ b/target/product/core_tiny.mk
@@ -62,6 +62,7 @@
     ld.config.txt \
     ld.mc \
     libaaudio \
+    libamidi \
     libOpenMAXAL \
     libOpenSLES \
     libdownmix \