Split //ios/chrome/browser in multiple targets.

ios/chrome/browser/metrics/BUILD.gn

Index: ios/chrome/browser/metrics/BUILD.gn
diff --git a/ios/chrome/browser/metrics/BUILD.gn b/ios/chrome/browser/metrics/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..e3b7fcc27bc0e81879cde81c4d1066fb91c25930
--- /dev/null
+++ b/ios/chrome/browser/metrics/BUILD.gn
@@ -0,0 +1,79 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+source_set("metrics") {
+  sources = [
+    "field_trial_synchronizer.cc",
+    "field_trial_synchronizer.h",
+    "ios_chrome_metrics_service_accessor.cc",
+    "ios_chrome_metrics_service_accessor.h",
+    "ios_chrome_metrics_service_client.cc",
+    "ios_chrome_metrics_service_client.h",
+    "ios_chrome_metrics_services_manager_client.h",
+    "ios_chrome_metrics_services_manager_client.mm",
+    "ios_chrome_origins_seen_service_factory.cc",
+    "ios_chrome_origins_seen_service_factory.h",
+    "ios_chrome_stability_metrics_provider.cc",
+    "ios_chrome_stability_metrics_provider.h",
+    "mobile_session_shutdown_metrics_provider.h",
+    "mobile_session_shutdown_metrics_provider.mm",
+    "previous_session_info.h",
+    "previous_session_info.mm",
+    "previous_session_info_private.h",
+  ]
+  deps = [
+    "//base",
+    "//components/crash/core/common",
+    "//components/keyed_service/ios",
+    "//components/metrics",
+    "//components/metrics:net",
+    "//components/metrics:profiler",
+    "//components/metrics:ui",
+    "//components/metrics_services_manager",
+    "//components/navigation_metrics",
+    "//components/omnibox/browser",
+    "//components/prefs",
+    "//components/rappor",
+    "//components/signin/core/browser",
+    "//components/sync",
+    "//components/translate/core/browser",
+    "//components/variations",
+    "//components/variations/service",
+    "//components/version_info",
+    "//ios/chrome/browser:browser_no_public_deps",
+    "//ios/chrome/browser/browser_state",
+    "//ios/chrome/browser/crash_report",
+    "//ios/chrome/browser/google",
+    "//ios/chrome/browser/signin",
+    "//ios/chrome/browser/sync",
+    "//ios/chrome/browser/ui",
+    "//ios/chrome/browser/variations",
+    "//ios/chrome/browser/variations:ios_chrome_ui_string_overrider_factory",
+    "//ios/chrome/common",
+    "//ios/public/provider/chrome/browser",
+    "//ios/web",
+  ]
+}
+
+source_set("unit_tests") {
+  testonly = true
+  sources = [
+    "ios_chrome_metrics_service_accessor_unittest.cc",
+    "ios_chrome_stability_metrics_provider_unittest.cc",
+    "mobile_session_shutdown_metrics_provider_unittest.mm",
+    "previous_session_info_unittest.mm",
+  ]
+  deps = [
+    ":metrics",
+    "//base",
+    "//base/test:test_support",
+    "//components/metrics",
+    "//components/metrics:test_support",
+    "//components/prefs",
+    "//components/prefs:test_support",
+    "//components/version_info",
+    "//ios/chrome/test:test_support",
+    "//testing/gtest",
+  ]
+}