diff --git a/BUILD.gn b/BUILD.gn
new file mode 100644
index 0000000..fc25cd9
--- /dev/null
+++ b/BUILD.gn
@@ -0,0 +1,562 @@
+#
+# 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.
+#
+
+import("//common-mk/generate-dbus-adaptors.gni")
+import("//common-mk/generate-dbus-proxies.gni")
+import("//common-mk/openssl_pem.gni")
+import("//common-mk/pkg_config.gni")
+import("//common-mk/proto_library.gni")
+import("//update_engine/tar_bunzip2.gni")
+
+group("all") {
+  deps = [
+    ":delta_generator",
+    ":libpayload_consumer",
+    ":libpayload_generator",
+    ":libupdate_engine",
+    ":libupdate_engine_client",
+    ":update_engine",
+    ":update_engine-dbus-adaptor",
+    ":update_engine-dbus-kiosk-app-client",
+    ":update_engine_client",
+    ":update_metadata-protos",
+  ]
+
+  if (use.test) {
+    deps += [
+      ":test_http_server",
+      ":test_subprocess",
+      ":update_engine-test_images",
+      ":update_engine-testkeys",
+      ":update_engine_test_libs",
+      ":update_engine_unittests",
+    ]
+  }
+
+  if (use.fuzzer) {
+    deps += [ ":update_engine_omaha_request_action_fuzzer" ]
+  }
+}
+
+pkg_config("target_defaults") {
+  cflags_cc = [
+    "-fno-strict-aliasing",
+    "-Wnon-virtual-dtor",
+  ]
+  cflags = [
+    "-g",
+    "-ffunction-sections",
+    "-Wall",
+    "-Wextra",
+    "-Werror",
+    "-Wno-unused-parameter",
+  ]
+  ldflags = [ "-Wl,--gc-sections" ]
+  defines = [
+    "__CHROMEOS__",
+    "_FILE_OFFSET_BITS=64",
+    "_POSIX_C_SOURCE=199309L",
+    "USE_BINDER=${use.binder}",
+    "USE_DBUS=${use.dbus}",
+    "USE_FEC=0",
+    "USE_HWID_OVERRIDE=${use.hwid_override}",
+    "USE_CHROME_KIOSK_APP=${use.chrome_kiosk_app}",
+    "USE_CHROME_NETWORK_PROXY=${use.chrome_network_proxy}",
+    "USE_MTD=${use.mtd}",
+    "USE_OMAHA=1",
+    "USE_SHILL=1",
+  ]
+  include_dirs = [
+    # We need this include dir because we include all the local code as
+    # "update_engine/...".
+    "${platform2_root}",
+    "${platform2_root}/update_engine/client_library/include",
+  ]
+  pkg_deps = [
+    "libbrillo-${libbase_ver}",
+    "libchrome-${libbase_ver}",
+
+    # system_api depends on protobuf (or protobuf-lite). It must appear
+    # before protobuf here or the linker flags won't be in the right
+    # order.
+    "system_api",
+    "protobuf-lite",
+  ]
+}
+
+# Protobufs.
+proto_library("update_metadata-protos") {
+  proto_in_dir = "."
+  proto_out_dir = "include/update_engine"
+  sources = [
+    "update_metadata.proto",
+  ]
+}
+
+# Chrome D-Bus bindings.
+generate_dbus_adaptors("update_engine-dbus-adaptor") {
+  dbus_adaptors_out_dir = "include/dbus_bindings"
+  sources = [
+    "dbus_bindings/org.chromium.UpdateEngineInterface.dbus-xml",
+  ]
+}
+
+generate_dbus_proxies("update_engine-dbus-kiosk-app-client") {
+  mock_output_file = "include/kiosk-app/dbus-proxy-mocks.h"
+  proxy_output_file = "include/kiosk-app/dbus-proxies.h"
+  sources = [
+    "dbus_bindings/org.chromium.KioskAppService.dbus-xml",
+  ]
+}
+
+# The payload application component and common dependencies.
+static_library("libpayload_consumer") {
+  sources = [
+    "common/action_processor.cc",
+    "common/boot_control_stub.cc",
+    "common/clock.cc",
+    "common/constants.cc",
+    "common/cpu_limiter.cc",
+    "common/error_code_utils.cc",
+    "common/hash_calculator.cc",
+    "common/http_common.cc",
+    "common/http_fetcher.cc",
+    "common/hwid_override.cc",
+    "common/multi_range_http_fetcher.cc",
+    "common/platform_constants_chromeos.cc",
+    "common/prefs.cc",
+    "common/proxy_resolver.cc",
+    "common/subprocess.cc",
+    "common/terminator.cc",
+    "common/utils.cc",
+    "payload_consumer/bzip_extent_writer.cc",
+    "payload_consumer/cached_file_descriptor.cc",
+    "payload_consumer/delta_performer.cc",
+    "payload_consumer/download_action.cc",
+    "payload_consumer/extent_reader.cc",
+    "payload_consumer/extent_writer.cc",
+    "payload_consumer/file_descriptor.cc",
+    "payload_consumer/file_descriptor_utils.cc",
+    "payload_consumer/file_writer.cc",
+    "payload_consumer/filesystem_verifier_action.cc",
+    "payload_consumer/install_plan.cc",
+    "payload_consumer/mount_history.cc",
+    "payload_consumer/payload_constants.cc",
+    "payload_consumer/payload_metadata.cc",
+    "payload_consumer/payload_verifier.cc",
+    "payload_consumer/postinstall_runner_action.cc",
+    "payload_consumer/verity_writer_stub.cc",
+    "payload_consumer/xz_extent_writer.cc",
+  ]
+  configs += [ ":target_defaults" ]
+  libs = [
+    "bz2",
+    "rt",
+  ]
+
+  # TODO(deymo): Remove unused dependencies once we stop including files
+  # from the root directory.
+  all_dependent_pkg_deps = [
+    "libcrypto",
+    "xz-embedded",
+    "libbspatch",
+    "libpuffpatch",
+  ]
+  deps = [
+    ":update_metadata-protos",
+  ]
+
+  if (use.mtd) {
+    sources += [ "payload_consumer/mtd_file_descriptor.cc" ]
+    libs += [ "mtdutils" ]
+  }
+}
+
+# The main daemon static_library with all the code used to check for updates
+# with Omaha and expose a DBus daemon.
+static_library("libupdate_engine") {
+  sources = [
+    "boot_control_chromeos.cc",
+    "certificate_checker.cc",
+    "common_service.cc",
+    "connection_manager.cc",
+    "connection_utils.cc",
+    "daemon.cc",
+    "dbus_connection.cc",
+    "dbus_service.cc",
+    "hardware_chromeos.cc",
+    "image_properties_chromeos.cc",
+    "libcurl_http_fetcher.cc",
+    "metrics_reporter_omaha.cc",
+    "metrics_utils.cc",
+    "omaha_request_action.cc",
+    "omaha_request_builder_xml.cc",
+    "omaha_request_params.cc",
+    "omaha_response_handler_action.cc",
+    "omaha_utils.cc",
+    "p2p_manager.cc",
+    "payload_state.cc",
+    "power_manager_chromeos.cc",
+    "real_system_state.cc",
+    "shill_proxy.cc",
+    "update_attempter.cc",
+    "update_boot_flags_action.cc",
+    "update_manager/boxed_value.cc",
+    "update_manager/chromeos_policy.cc",
+    "update_manager/default_policy.cc",
+    "update_manager/enough_slots_ab_updates_policy_impl.cc",
+    "update_manager/enterprise_device_policy_impl.cc",
+    "update_manager/evaluation_context.cc",
+    "update_manager/interactive_update_policy_impl.cc",
+    "update_manager/next_update_check_policy_impl.cc",
+    "update_manager/official_build_check_policy_impl.cc",
+    "update_manager/out_of_box_experience_policy_impl.cc",
+    "update_manager/policy.cc",
+    "update_manager/policy_test_utils.cc",
+    "update_manager/real_config_provider.cc",
+    "update_manager/real_device_policy_provider.cc",
+    "update_manager/real_random_provider.cc",
+    "update_manager/real_shill_provider.cc",
+    "update_manager/real_system_provider.cc",
+    "update_manager/real_time_provider.cc",
+    "update_manager/real_updater_provider.cc",
+    "update_manager/staging_utils.cc",
+    "update_manager/state_factory.cc",
+    "update_manager/update_manager.cc",
+    "update_manager/update_time_restrictions_policy_impl.cc",
+    "update_manager/weekly_time.cc",
+    "update_status_utils.cc",
+  ]
+  configs += [ ":target_defaults" ]
+  libs = [
+    "bz2",
+    "policy-${libbase_ver}",
+    "rootdev",
+    "rt",
+  ]
+  all_dependent_pkg_deps = [
+    "dbus-1",
+    "expat",
+    "libcurl",
+    "libdebugd-client",
+    "libmetrics-${libbase_ver}",
+    "libpower_manager-client",
+    "libsession_manager-client",
+    "libshill-client",
+    "libssl",
+    "libupdate_engine-client",
+    "vboot_host",
+  ]
+  deps = [
+    ":libpayload_consumer",
+    ":update_engine-dbus-adaptor",
+    ":update_metadata-protos",
+  ]
+
+  if (use.dlc) {
+    all_dependent_pkg_deps += [ "libdlcservice-client" ]
+  }
+
+  if (use.chrome_network_proxy) {
+    sources += [ "chrome_browser_proxy_resolver.cc" ]
+  }
+
+  if (use.chrome_kiosk_app) {
+    deps += [ ":update_engine-dbus-kiosk-app-client" ]
+  }
+
+  if (use.dlc) {
+    sources += [ "dlcservice_chromeos.cc" ]
+  } else {
+    sources += [ "common/dlcservice_stub.cc" ]
+  }
+}
+
+# update_engine daemon.
+executable("update_engine") {
+  sources = [
+    "main.cc",
+  ]
+  configs += [ ":target_defaults" ]
+  deps = [
+    ":libupdate_engine",
+  ]
+}
+
+# update_engine client library.
+static_library("libupdate_engine_client") {
+  sources = [
+    "client_library/client.cc",
+    "client_library/client_dbus.cc",
+    "update_status_utils.cc",
+  ]
+  include_dirs = [ "client_library/include" ]
+  configs += [ ":target_defaults" ]
+  pkg_deps = [
+    "dbus-1",
+    "libupdate_engine-client",
+  ]
+}
+
+# update_engine console client.
+executable("update_engine_client") {
+  sources = [
+    "common/error_code_utils.cc",
+    "omaha_utils.cc",
+    "update_engine_client.cc",
+  ]
+  configs += [ ":target_defaults" ]
+  deps = [
+    ":libupdate_engine_client",
+  ]
+}
+
+# server-side code. This is used for delta_generator and unittests but not
+# for any client code.
+static_library("libpayload_generator") {
+  sources = [
+    "common/file_fetcher.cc",
+    "payload_generator/ab_generator.cc",
+    "payload_generator/annotated_operation.cc",
+    "payload_generator/blob_file_writer.cc",
+    "payload_generator/block_mapping.cc",
+    "payload_generator/boot_img_filesystem.cc",
+    "payload_generator/bzip.cc",
+    "payload_generator/cycle_breaker.cc",
+    "payload_generator/deflate_utils.cc",
+    "payload_generator/delta_diff_generator.cc",
+    "payload_generator/delta_diff_utils.cc",
+    "payload_generator/ext2_filesystem.cc",
+    "payload_generator/extent_ranges.cc",
+    "payload_generator/extent_utils.cc",
+    "payload_generator/full_update_generator.cc",
+    "payload_generator/graph_types.cc",
+    "payload_generator/graph_utils.cc",
+    "payload_generator/inplace_generator.cc",
+    "payload_generator/mapfile_filesystem.cc",
+    "payload_generator/payload_file.cc",
+    "payload_generator/payload_generation_config.cc",
+    "payload_generator/payload_generation_config_chromeos.cc",
+    "payload_generator/payload_signer.cc",
+    "payload_generator/raw_filesystem.cc",
+    "payload_generator/squashfs_filesystem.cc",
+    "payload_generator/tarjan.cc",
+    "payload_generator/topological_sort.cc",
+    "payload_generator/xz_chromeos.cc",
+  ]
+  configs += [ ":target_defaults" ]
+  all_dependent_pkg_deps = [
+    "ext2fs",
+    "libbsdiff",
+    "libpuffdiff",
+    "liblzma",
+  ]
+  deps = [
+    ":libpayload_consumer",
+    ":update_metadata-protos",
+  ]
+}
+
+# server-side delta generator.
+executable("delta_generator") {
+  sources = [
+    "payload_generator/generate_delta_main.cc",
+  ]
+  configs += [ ":target_defaults" ]
+  configs -= [ "//common-mk:pie" ]
+  deps = [
+    ":libpayload_consumer",
+    ":libpayload_generator",
+  ]
+}
+
+if (use.test || use.fuzzer) {
+  static_library("update_engine_test_libs") {
+    sources = [
+      "common/fake_prefs.cc",
+      "common/mock_http_fetcher.cc",
+      "common/test_utils.cc",
+      "fake_shill_proxy.cc",
+      "fake_system_state.cc",
+      "payload_consumer/fake_file_descriptor.cc",
+      "payload_generator/fake_filesystem.cc",
+      "update_manager/umtest_utils.cc",
+    ]
+    all_dependent_configs = [ "//common-mk:test" ]
+    configs += [ ":target_defaults" ]
+    pkg_deps = [ "libshill-client-test" ]
+    deps = [
+      ":libupdate_engine",
+    ]
+  }
+}
+
+if (use.test) {
+  # Public keys used for unit testing.
+  genopenssl_key("update_engine-testkeys") {
+    openssl_pem_in_dir = "."
+    openssl_pem_out_dir = "include/update_engine"
+    sources = [
+      "unittest_key.pem",
+      "unittest_key2.pem",
+    ]
+  }
+
+  # Unpacks sample images used for testing.
+  tar_bunzip2("update_engine-test_images") {
+    image_out_dir = "."
+    sources = [
+      "sample_images/sample_images.tar.bz2",
+    ]
+  }
+
+  # Test HTTP Server.
+  executable("test_http_server") {
+    sources = [
+      "common/http_common.cc",
+      "test_http_server.cc",
+    ]
+    configs += [ ":target_defaults" ]
+  }
+
+  # Test subprocess helper.
+  executable("test_subprocess") {
+    sources = [
+      "test_subprocess.cc",
+    ]
+    configs += [ ":target_defaults" ]
+  }
+
+  # Main unittest file.
+  executable("update_engine_unittests") {
+    sources = [
+      "boot_control_chromeos_unittest.cc",
+      "certificate_checker_unittest.cc",
+      "common/action_pipe_unittest.cc",
+      "common/action_processor_unittest.cc",
+      "common/action_unittest.cc",
+      "common/cpu_limiter_unittest.cc",
+      "common/hash_calculator_unittest.cc",
+      "common/http_fetcher_unittest.cc",
+      "common/hwid_override_unittest.cc",
+      "common/prefs_unittest.cc",
+      "common/proxy_resolver_unittest.cc",
+      "common/subprocess_unittest.cc",
+      "common/terminator_unittest.cc",
+      "common/utils_unittest.cc",
+      "common_service_unittest.cc",
+      "connection_manager_unittest.cc",
+      "hardware_chromeos_unittest.cc",
+      "image_properties_chromeos_unittest.cc",
+      "metrics_reporter_omaha_unittest.cc",
+      "metrics_utils_unittest.cc",
+      "omaha_request_action_unittest.cc",
+      "omaha_request_builder_xml_unittest.cc",
+      "omaha_request_params_unittest.cc",
+      "omaha_response_handler_action_unittest.cc",
+      "omaha_utils_unittest.cc",
+      "p2p_manager_unittest.cc",
+      "payload_consumer/bzip_extent_writer_unittest.cc",
+      "payload_consumer/cached_file_descriptor_unittest.cc",
+      "payload_consumer/delta_performer_integration_test.cc",
+      "payload_consumer/delta_performer_unittest.cc",
+      "payload_consumer/download_action_unittest.cc",
+      "payload_consumer/extent_reader_unittest.cc",
+      "payload_consumer/extent_writer_unittest.cc",
+      "payload_consumer/file_descriptor_utils_unittest.cc",
+      "payload_consumer/file_writer_unittest.cc",
+      "payload_consumer/filesystem_verifier_action_unittest.cc",
+      "payload_consumer/postinstall_runner_action_unittest.cc",
+      "payload_consumer/xz_extent_writer_unittest.cc",
+      "payload_generator/ab_generator_unittest.cc",
+      "payload_generator/blob_file_writer_unittest.cc",
+      "payload_generator/block_mapping_unittest.cc",
+      "payload_generator/boot_img_filesystem_unittest.cc",
+      "payload_generator/cycle_breaker_unittest.cc",
+      "payload_generator/deflate_utils_unittest.cc",
+      "payload_generator/delta_diff_utils_unittest.cc",
+      "payload_generator/ext2_filesystem_unittest.cc",
+      "payload_generator/extent_ranges_unittest.cc",
+      "payload_generator/extent_utils_unittest.cc",
+      "payload_generator/full_update_generator_unittest.cc",
+      "payload_generator/graph_utils_unittest.cc",
+      "payload_generator/inplace_generator_unittest.cc",
+      "payload_generator/mapfile_filesystem_unittest.cc",
+      "payload_generator/payload_file_unittest.cc",
+      "payload_generator/payload_generation_config_unittest.cc",
+      "payload_generator/payload_signer_unittest.cc",
+      "payload_generator/squashfs_filesystem_unittest.cc",
+      "payload_generator/tarjan_unittest.cc",
+      "payload_generator/topological_sort_unittest.cc",
+      "payload_generator/zip_unittest.cc",
+      "payload_state_unittest.cc",
+      "testrunner.cc",
+      "update_attempter_unittest.cc",
+      "update_boot_flags_action_unittest.cc",
+      "update_manager/boxed_value_unittest.cc",
+      "update_manager/chromeos_policy_unittest.cc",
+      "update_manager/evaluation_context_unittest.cc",
+      "update_manager/generic_variables_unittest.cc",
+      "update_manager/prng_unittest.cc",
+      "update_manager/real_device_policy_provider_unittest.cc",
+      "update_manager/real_random_provider_unittest.cc",
+      "update_manager/real_shill_provider_unittest.cc",
+      "update_manager/real_system_provider_unittest.cc",
+      "update_manager/real_time_provider_unittest.cc",
+      "update_manager/real_updater_provider_unittest.cc",
+      "update_manager/staging_utils_unittest.cc",
+      "update_manager/update_manager_unittest.cc",
+      "update_manager/update_time_restrictions_policy_impl_unittest.cc",
+      "update_manager/variable_unittest.cc",
+      "update_manager/weekly_time_unittest.cc",
+    ]
+    configs += [ ":target_defaults" ]
+    pkg_deps = [
+      "libbrillo-test-${libbase_ver}",
+      "libchrome-test-${libbase_ver}",
+      "libdebugd-client-test",
+      "libpower_manager-client-test",
+      "libsession_manager-client-test",
+      "libshill-client-test",
+    ]
+    deps = [
+      ":libpayload_generator",
+      ":libupdate_engine",
+      ":update_engine_test_libs",
+    ]
+  }
+}
+
+# Fuzzer target.
+if (use.fuzzer) {
+  executable("update_engine_omaha_request_action_fuzzer") {
+    sources = [
+      "omaha_request_action_fuzzer.cc",
+    ]
+    configs += [
+      "//common-mk/common_fuzzer",
+      ":target_defaults",
+    ]
+    pkg_deps = [
+      "libbrillo-test-${libbase_ver}",
+      "libchrome-test-${libbase_ver}",
+    ]
+    deps = [
+      ":libupdate_engine",
+      ":update_engine_test_libs",
+    ]
+  }
+}
diff --git a/tar_bunzip2.gni b/tar_bunzip2.gni
new file mode 100644
index 0000000..0a17899
--- /dev/null
+++ b/tar_bunzip2.gni
@@ -0,0 +1,33 @@
+#
+# 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.
+#
+
+template("tar_bunzip2") {
+  forward_variables_from(invoker, [ "image_out_dir" ])
+  out_dir = "${root_gen_dir}/${image_out_dir}"
+
+  action_foreach(target_name) {
+    sources = invoker.sources
+    script = "//common-mk/file_generator_wrapper.py"
+    outputs = [
+      "${out_dir}/{{source_name_part}}.flag",
+    ]
+    args = [
+      "sh",
+      "-c",
+      "tar -xvf \"{{source}}\" -C \"${out_dir}\" && touch ${out_dir}/{{source_name_part}}.flag",
+    ]
+  }
+}
diff --git a/tar_bunzip2.gypi b/tar_bunzip2.gypi
deleted file mode 100644
index 4d1be28..0000000
--- a/tar_bunzip2.gypi
+++ /dev/null
@@ -1,39 +0,0 @@
-#
-# Copyright (C) 2015 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.
-#
-{
-  'variables': {
-    'out_dir': '<(SHARED_INTERMEDIATE_DIR)/<(image_out_dir)',
-  },
-  'rules': [
-    {
-      'rule_name': 'tar-bunzip2',
-      'extension': 'bz2',
-      'outputs': [
-        # The .flag file is used to mark the timestamp of the file extraction
-        # and re-run this action if a new .bz2 file is generated.
-        '<(out_dir)/<(RULE_INPUT_ROOT).flag',
-      ],
-      'action': [
-        'sh',
-        '-c',
-        'tar -xvf "<(RULE_INPUT_PATH)" -C "<(out_dir)" && touch <(out_dir)/<(RULE_INPUT_ROOT).flag',
-      ],
-      'msvs_cygwin_shell': 0,
-      'process_outputs_as_sources': 1,
-      'message': 'Unpacking file <(RULE_INPUT_PATH)',
-    },
-  ],
-}
diff --git a/update_engine.gyp b/update_engine.gyp
deleted file mode 100644
index b7ccae8..0000000
--- a/update_engine.gyp
+++ /dev/null
@@ -1,656 +0,0 @@
-#
-# Copyright (C) 2015 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.
-#
-
-# TODO: Rename these files to pass this check.
-# gyplint: disable=GypLintSourceFileNames
-{
-  'variables': {
-    'USE_chrome_network_proxy': '1',
-    'USE_chrome_kiosk_app': '1',
-  },
-  'target_defaults': {
-    'variables': {
-      'deps': [
-        'libbrillo-<(libbase_ver)',
-        'libchrome-<(libbase_ver)',
-        # system_api depends on protobuf (or protobuf-lite). It must appear
-        # before protobuf here or the linker flags won't be in the right
-        # order.
-        'system_api',
-        'protobuf-lite',
-      ],
-      # The -DUSE_* flags are passed from platform2.py. We use sane defaults
-      # here when these USE flags are not defined. You can set the default value
-      # for the USE flag in the ebuild.
-      'USE_hwid_override%': '0',
-    },
-    'cflags': [
-      '-g',
-      '-ffunction-sections',
-      '-Wall',
-      '-Wextra',
-      '-Werror',
-      '-Wno-unused-parameter',
-    ],
-    'cflags_cc': [
-      '-fno-strict-aliasing',
-      '-Wnon-virtual-dtor',
-    ],
-    'ldflags': [
-      '-Wl,--gc-sections',
-    ],
-    'defines': [
-      '__CHROMEOS__',
-      '_FILE_OFFSET_BITS=64',
-      '_POSIX_C_SOURCE=199309L',
-      'USE_BINDER=<(USE_binder)',
-      'USE_DBUS=<(USE_dbus)',
-      'USE_FEC=0',
-      'USE_HWID_OVERRIDE=<(USE_hwid_override)',
-      'USE_CHROME_KIOSK_APP=<(USE_chrome_kiosk_app)',
-      'USE_CHROME_NETWORK_PROXY=<(USE_chrome_network_proxy)',
-      'USE_MTD=<(USE_mtd)',
-      'USE_OMAHA=1',
-      'USE_SHILL=1',
-    ],
-    'include_dirs': [
-      # We need this include dir because we include all the local code as
-      # "update_engine/...".
-      '<(platform2_root)/../aosp/system',
-      '<(platform2_root)/../aosp/system/update_engine/client_library/include',
-    ],
-  },
-  'targets': [
-    # Protobufs.
-    {
-      'target_name': 'update_metadata-protos',
-      'type': 'static_library',
-      'variables': {
-        'proto_in_dir': '.',
-        'proto_out_dir': 'include/update_engine',
-      },
-      'sources': [
-        'update_metadata.proto',
-      ],
-      'includes': ['../../../platform2/common-mk/protoc.gypi'],
-    },
-    # Chrome D-Bus bindings.
-    {
-      'target_name': 'update_engine-dbus-adaptor',
-      'type': 'none',
-      'variables': {
-        'dbus_adaptors_out_dir': 'include/dbus_bindings',
-        'dbus_xml_extension': 'dbus-xml',
-      },
-      'sources': [
-        'dbus_bindings/org.chromium.UpdateEngineInterface.dbus-xml',
-      ],
-      'includes': ['../../../platform2/common-mk/generate-dbus-adaptors.gypi'],
-    },
-    {
-      'target_name': 'update_engine-dbus-kiosk-app-client',
-      'type': 'none',
-      'actions': [{
-        'action_name': 'update_engine-dbus-kiosk-app-client-action',
-        'variables': {
-          'mock_output_file': 'include/kiosk-app/dbus-proxy-mocks.h',
-          'proxy_output_file': 'include/kiosk-app/dbus-proxies.h',
-        },
-        'sources': [
-          'dbus_bindings/org.chromium.KioskAppService.dbus-xml',
-        ],
-        'includes': ['../../../platform2/common-mk/generate-dbus-proxies.gypi'],
-      }],
-    },
-    # The payload application component and common dependencies.
-    {
-      'target_name': 'libpayload_consumer',
-      'type': 'static_library',
-      'dependencies': [
-        'update_metadata-protos',
-      ],
-      # TODO(deymo): Remove unused dependencies once we stop including files
-      # from the root directory.
-      'variables': {
-        'exported_deps': [
-          'libcrypto',
-          'xz-embedded',
-          'libbspatch',
-          'libpuffpatch',
-        ],
-        'deps': ['<@(exported_deps)'],
-      },
-      'all_dependent_settings': {
-        'variables': {
-          'deps': [
-            '<@(exported_deps)',
-          ],
-        },
-      },
-      'link_settings': {
-        'variables': {
-          'deps': [
-            '<@(exported_deps)',
-          ],
-        },
-        'libraries': [
-          '-lbz2',
-          '-lrt',
-        ],
-      },
-      'sources': [
-        'common/action_processor.cc',
-        'common/boot_control_stub.cc',
-        'common/clock.cc',
-        'common/constants.cc',
-        'common/cpu_limiter.cc',
-        'common/error_code_utils.cc',
-        'common/hash_calculator.cc',
-        'common/http_common.cc',
-        'common/http_fetcher.cc',
-        'common/hwid_override.cc',
-        'common/multi_range_http_fetcher.cc',
-        'common/platform_constants_chromeos.cc',
-        'common/prefs.cc',
-        'common/proxy_resolver.cc',
-        'common/subprocess.cc',
-        'common/terminator.cc',
-        'common/utils.cc',
-        'payload_consumer/bzip_extent_writer.cc',
-        'payload_consumer/cached_file_descriptor.cc',
-        'payload_consumer/delta_performer.cc',
-        'payload_consumer/download_action.cc',
-        'payload_consumer/extent_reader.cc',
-        'payload_consumer/extent_writer.cc',
-        'payload_consumer/file_descriptor.cc',
-        'payload_consumer/file_descriptor_utils.cc',
-        'payload_consumer/file_writer.cc',
-        'payload_consumer/filesystem_verifier_action.cc',
-        'payload_consumer/install_plan.cc',
-        'payload_consumer/mount_history.cc',
-        'payload_consumer/payload_constants.cc',
-        'payload_consumer/payload_metadata.cc',
-        'payload_consumer/payload_verifier.cc',
-        'payload_consumer/postinstall_runner_action.cc',
-        'payload_consumer/verity_writer_stub.cc',
-        'payload_consumer/xz_extent_writer.cc',
-      ],
-      'conditions': [
-        ['USE_mtd == 1', {
-          'sources': [
-            'payload_consumer/mtd_file_descriptor.cc',
-          ],
-          'link_settings': {
-            'libraries': [
-              '-lmtdutils',
-            ],
-          },
-        }],
-      ],
-    },
-    # The main daemon static_library with all the code used to check for updates
-    # with Omaha and expose a DBus daemon.
-    {
-      'target_name': 'libupdate_engine',
-      'type': 'static_library',
-      'dependencies': [
-        'libpayload_consumer',
-        'update_metadata-protos',
-        'update_engine-dbus-adaptor',
-      ],
-      'variables': {
-        'exported_deps': [
-          'dbus-1',
-          'expat',
-          'libcurl',
-          'libdebugd-client',
-          'libmetrics-<(libbase_ver)',
-          'libpower_manager-client',
-          'libsession_manager-client',
-          'libshill-client',
-          'libssl',
-          'libupdate_engine-client',
-          'vboot_host',
-        ],
-        'conditions':[
-          ['USE_dlc == 1', {
-            'exported_deps' : [
-              'libdlcservice-client',
-            ],
-          }],
-        ],
-        'deps': ['<@(exported_deps)'],
-      },
-      'all_dependent_settings': {
-        'variables': {
-          'deps': [
-            '<@(exported_deps)',
-          ],
-        },
-      },
-      'link_settings': {
-        'variables': {
-          'deps': [
-            '<@(exported_deps)',
-          ],
-        },
-        'libraries': [
-          '-lbz2',
-          '-lpolicy-<(libbase_ver)',
-          '-lrootdev',
-          '-lrt',
-        ],
-      },
-      'sources': [
-        'boot_control_chromeos.cc',
-        'certificate_checker.cc',
-        'common_service.cc',
-        'connection_manager.cc',
-        'connection_utils.cc',
-        'daemon.cc',
-        'dbus_connection.cc',
-        'dbus_service.cc',
-        'hardware_chromeos.cc',
-        'image_properties_chromeos.cc',
-        'libcurl_http_fetcher.cc',
-        'metrics_reporter_omaha.cc',
-        'metrics_utils.cc',
-        'omaha_request_action.cc',
-        'omaha_request_builder_xml.cc',
-        'omaha_request_params.cc',
-        'omaha_response_handler_action.cc',
-        'omaha_utils.cc',
-        'p2p_manager.cc',
-        'payload_state.cc',
-        'power_manager_chromeos.cc',
-        'real_system_state.cc',
-        'shill_proxy.cc',
-        'update_attempter.cc',
-        'update_boot_flags_action.cc',
-        'update_manager/boxed_value.cc',
-        'update_manager/chromeos_policy.cc',
-        'update_manager/default_policy.cc',
-        'update_manager/enough_slots_ab_updates_policy_impl.cc',
-        'update_manager/enterprise_device_policy_impl.cc',
-        'update_manager/evaluation_context.cc',
-        'update_manager/interactive_update_policy_impl.cc',
-        'update_manager/next_update_check_policy_impl.cc',
-        'update_manager/official_build_check_policy_impl.cc',
-        'update_manager/out_of_box_experience_policy_impl.cc',
-        'update_manager/policy.cc',
-        'update_manager/policy_test_utils.cc',
-        'update_manager/real_config_provider.cc',
-        'update_manager/real_device_policy_provider.cc',
-        'update_manager/real_random_provider.cc',
-        'update_manager/real_shill_provider.cc',
-        'update_manager/real_system_provider.cc',
-        'update_manager/real_time_provider.cc',
-        'update_manager/real_updater_provider.cc',
-        'update_manager/staging_utils.cc',
-        'update_manager/state_factory.cc',
-        'update_manager/update_manager.cc',
-        'update_manager/update_time_restrictions_policy_impl.cc',
-        'update_manager/weekly_time.cc',
-        'update_status_utils.cc',
-      ],
-      'conditions': [
-        ['USE_chrome_network_proxy == 1', {
-          'sources': [
-            'chrome_browser_proxy_resolver.cc',
-          ],
-        }],
-        ['USE_chrome_kiosk_app == 1', {
-          'dependencies': [
-            'update_engine-dbus-kiosk-app-client',
-          ],
-        }],
-        ['USE_dlc == 1', {
-          'sources': [
-            'dlcservice_chromeos.cc',
-          ],
-        }],
-        ['USE_dlc == 0', {
-          'sources': [
-            'common/dlcservice_stub.cc',
-          ],
-        }],
-      ],
-    },
-    # update_engine daemon.
-    {
-      'target_name': 'update_engine',
-      'type': 'executable',
-      'dependencies': [
-        'libupdate_engine',
-      ],
-      'sources': [
-        'main.cc',
-      ],
-    },
-    # update_engine client library.
-    {
-      'target_name': 'libupdate_engine_client',
-      'type': 'static_library',
-      'variables': {
-        'deps': [
-          'dbus-1',
-          'libupdate_engine-client',
-        ],
-      },
-      'sources': [
-        'client_library/client.cc',
-        'client_library/client_dbus.cc',
-        'update_status_utils.cc',
-      ],
-      'include_dirs': [
-        'client_library/include',
-      ],
-    },
-    # update_engine console client.
-    {
-      'target_name': 'update_engine_client',
-      'type': 'executable',
-      'dependencies': [
-        'libupdate_engine_client',
-      ],
-      'sources': [
-        'common/error_code_utils.cc',
-        'omaha_utils.cc',
-        'update_engine_client.cc',
-      ],
-    },
-    # server-side code. This is used for delta_generator and unittests but not
-    # for any client code.
-    {
-      'target_name': 'libpayload_generator',
-      'type': 'static_library',
-      'dependencies': [
-        'libpayload_consumer',
-        'update_metadata-protos',
-      ],
-      'variables': {
-        'exported_deps': [
-          'ext2fs',
-          'libbsdiff',
-          'libpuffdiff',
-          'liblzma',
-        ],
-        'deps': ['<@(exported_deps)'],
-      },
-      'all_dependent_settings': {
-        'variables': {
-          'deps': [
-            '<@(exported_deps)',
-          ],
-        },
-      },
-      'link_settings': {
-        'variables': {
-          'deps': [
-            '<@(exported_deps)',
-          ],
-        },
-      },
-      'sources': [
-        'common/file_fetcher.cc',
-        'payload_generator/ab_generator.cc',
-        'payload_generator/annotated_operation.cc',
-        'payload_generator/blob_file_writer.cc',
-        'payload_generator/block_mapping.cc',
-        'payload_generator/boot_img_filesystem.cc',
-        'payload_generator/bzip.cc',
-        'payload_generator/cycle_breaker.cc',
-        'payload_generator/deflate_utils.cc',
-        'payload_generator/delta_diff_generator.cc',
-        'payload_generator/delta_diff_utils.cc',
-        'payload_generator/ext2_filesystem.cc',
-        'payload_generator/extent_ranges.cc',
-        'payload_generator/extent_utils.cc',
-        'payload_generator/full_update_generator.cc',
-        'payload_generator/graph_types.cc',
-        'payload_generator/graph_utils.cc',
-        'payload_generator/inplace_generator.cc',
-        'payload_generator/mapfile_filesystem.cc',
-        'payload_generator/payload_file.cc',
-        'payload_generator/payload_generation_config.cc',
-        'payload_generator/payload_generation_config_chromeos.cc',
-        'payload_generator/payload_signer.cc',
-        'payload_generator/raw_filesystem.cc',
-        'payload_generator/squashfs_filesystem.cc',
-        'payload_generator/tarjan.cc',
-        'payload_generator/topological_sort.cc',
-        'payload_generator/xz_chromeos.cc',
-      ],
-    },
-    # server-side delta generator.
-    {
-      'target_name': 'delta_generator',
-      'type': 'executable',
-      'dependencies': [
-        'libpayload_consumer',
-        'libpayload_generator',
-      ],
-      'link_settings': {
-        'ldflags!': [
-          '-pie',
-        ],
-      },
-      'sources': [
-        'payload_generator/generate_delta_main.cc',
-      ],
-    },
-    {
-      'target_name': 'update_engine_test_libs',
-      'type': 'static_library',
-      'variables': {
-        'deps': [
-          'libshill-client-test',
-        ],
-      },
-      'dependencies': [
-        'libupdate_engine',
-      ],
-      'includes': [
-        '../../../platform2/common-mk/common_test.gypi',
-      ],
-      'sources': [
-        'common/fake_prefs.cc',
-        'common/mock_http_fetcher.cc',
-        'common/test_utils.cc',
-        'fake_shill_proxy.cc',
-        'fake_system_state.cc',
-        'payload_consumer/fake_file_descriptor.cc',
-        'payload_generator/fake_filesystem.cc',
-        'update_manager/umtest_utils.cc',
-      ],
-    },
-  ],
-  'conditions': [
-    ['USE_test == 1', {
-      'targets': [
-        # Public keys used for unit testing.
-        {
-          'target_name': 'update_engine-testkeys',
-          'type': 'none',
-          'variables': {
-            'openssl_pem_in_dir': '.',
-            'openssl_pem_out_dir': 'include/update_engine',
-          },
-          'sources': [
-            'unittest_key.pem',
-            'unittest_key2.pem',
-          ],
-          'includes': ['../../../platform2/common-mk/openssl_pem.gypi'],
-        },
-        # Unpacks sample images used for testing.
-        {
-          'target_name': 'update_engine-test_images',
-          'type': 'none',
-          'variables': {
-            'image_out_dir': '.',
-          },
-          'sources': [
-            'sample_images/sample_images.tar.bz2',
-          ],
-          'includes': ['tar_bunzip2.gypi'],
-        },
-        # Test HTTP Server.
-        {
-          'target_name': 'test_http_server',
-          'type': 'executable',
-          'sources': [
-            'common/http_common.cc',
-            'test_http_server.cc',
-          ],
-        },
-        # Test subprocess helper.
-        {
-          'target_name': 'test_subprocess',
-          'type': 'executable',
-          'sources': [
-            'test_subprocess.cc',
-          ],
-        },
-        # Main unittest file.
-        {
-          'target_name': 'update_engine_unittests',
-          'type': 'executable',
-          'variables': {
-            'deps': [
-              'libbrillo-test-<(libbase_ver)',
-              'libchrome-test-<(libbase_ver)',
-              'libdebugd-client-test',
-              'libpower_manager-client-test',
-              'libsession_manager-client-test',
-              'libshill-client-test',
-            ],
-          },
-          'dependencies': [
-            'libupdate_engine',
-            'libpayload_generator',
-            'update_engine_test_libs',
-          ],
-          'sources': [
-            'boot_control_chromeos_unittest.cc',
-            'certificate_checker_unittest.cc',
-            'common/action_pipe_unittest.cc',
-            'common/action_processor_unittest.cc',
-            'common/action_unittest.cc',
-            'common/cpu_limiter_unittest.cc',
-            'common/hash_calculator_unittest.cc',
-            'common/http_fetcher_unittest.cc',
-            'common/hwid_override_unittest.cc',
-            'common/prefs_unittest.cc',
-            'common/proxy_resolver_unittest.cc',
-            'common/subprocess_unittest.cc',
-            'common/terminator_unittest.cc',
-            'common/utils_unittest.cc',
-            'common_service_unittest.cc',
-            'connection_manager_unittest.cc',
-            'hardware_chromeos_unittest.cc',
-            'image_properties_chromeos_unittest.cc',
-            'metrics_reporter_omaha_unittest.cc',
-            'metrics_utils_unittest.cc',
-            'omaha_request_action_unittest.cc',
-            'omaha_request_builder_xml_unittest.cc',
-            'omaha_request_params_unittest.cc',
-            'omaha_response_handler_action_unittest.cc',
-            'omaha_utils_unittest.cc',
-            'p2p_manager_unittest.cc',
-            'payload_consumer/bzip_extent_writer_unittest.cc',
-            'payload_consumer/cached_file_descriptor_unittest.cc',
-            'payload_consumer/delta_performer_integration_test.cc',
-            'payload_consumer/delta_performer_unittest.cc',
-            'payload_consumer/download_action_unittest.cc',
-            'payload_consumer/extent_reader_unittest.cc',
-            'payload_consumer/extent_writer_unittest.cc',
-            'payload_consumer/file_descriptor_utils_unittest.cc',
-            'payload_consumer/file_writer_unittest.cc',
-            'payload_consumer/filesystem_verifier_action_unittest.cc',
-            'payload_consumer/postinstall_runner_action_unittest.cc',
-            'payload_consumer/xz_extent_writer_unittest.cc',
-            'payload_generator/ab_generator_unittest.cc',
-            'payload_generator/blob_file_writer_unittest.cc',
-            'payload_generator/block_mapping_unittest.cc',
-            'payload_generator/boot_img_filesystem_unittest.cc',
-            'payload_generator/cycle_breaker_unittest.cc',
-            'payload_generator/deflate_utils_unittest.cc',
-            'payload_generator/delta_diff_utils_unittest.cc',
-            'payload_generator/ext2_filesystem_unittest.cc',
-            'payload_generator/extent_ranges_unittest.cc',
-            'payload_generator/extent_utils_unittest.cc',
-            'payload_generator/full_update_generator_unittest.cc',
-            'payload_generator/graph_utils_unittest.cc',
-            'payload_generator/inplace_generator_unittest.cc',
-            'payload_generator/mapfile_filesystem_unittest.cc',
-            'payload_generator/payload_file_unittest.cc',
-            'payload_generator/payload_generation_config_unittest.cc',
-            'payload_generator/payload_signer_unittest.cc',
-            'payload_generator/squashfs_filesystem_unittest.cc',
-            'payload_generator/tarjan_unittest.cc',
-            'payload_generator/topological_sort_unittest.cc',
-            'payload_generator/zip_unittest.cc',
-            'payload_state_unittest.cc',
-            'testrunner.cc',
-            'update_attempter_unittest.cc',
-            'update_boot_flags_action_unittest.cc',
-            'update_manager/boxed_value_unittest.cc',
-            'update_manager/chromeos_policy_unittest.cc',
-            'update_manager/evaluation_context_unittest.cc',
-            'update_manager/generic_variables_unittest.cc',
-            'update_manager/prng_unittest.cc',
-            'update_manager/real_device_policy_provider_unittest.cc',
-            'update_manager/real_random_provider_unittest.cc',
-            'update_manager/real_shill_provider_unittest.cc',
-            'update_manager/real_system_provider_unittest.cc',
-            'update_manager/real_time_provider_unittest.cc',
-            'update_manager/real_updater_provider_unittest.cc',
-            'update_manager/staging_utils_unittest.cc',
-            'update_manager/update_manager_unittest.cc',
-            'update_manager/update_time_restrictions_policy_impl_unittest.cc',
-            'update_manager/variable_unittest.cc',
-            'update_manager/weekly_time_unittest.cc',
-          ],
-        },
-      ],
-    }],
-    # Fuzzer target.
-    ['USE_fuzzer == 1', {
-      'targets': [
-        {
-          'target_name': 'update_engine_omaha_request_action_fuzzer',
-          'type': 'executable',
-          'variables': {
-            'deps': [
-              'libbrillo-test-<(libbase_ver)',
-              'libchrome-test-<(libbase_ver)',
-            ],
-          },
-          'includes': [
-            '../../../platform2/common-mk/common_fuzzer.gypi',
-          ],
-          'dependencies': [
-            'libupdate_engine',
-            'update_engine_test_libs',
-          ],
-          'sources': [
-            'omaha_request_action_fuzzer.cc',
-          ],
-        },
-      ],
-    }],
-  ],
-}