Add support for building "ios_chrome_unittests" with gn.

ios/chrome/BUILD.gn

Index: ios/chrome/BUILD.gn
diff --git a/ios/chrome/BUILD.gn b/ios/chrome/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..daa2e2ed49e1e2dbe321c4797c8c65b2efa7bb03
--- /dev/null
+++ b/ios/chrome/BUILD.gn
@@ -0,0 +1,91 @@
+# Copyright 2015 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.
+
+import("//testing/test.gni")
+
+test("ios_chrome_unittests") {
+  sources = [
+    "app/safe_mode_util_unittest.cc",
+    "browser/chrome_url_util_unittest.mm",
+    "browser/crash_loop_detection_util_unittest.mm",
+    "browser/favicon/large_icon_cache_unittest.cc",
+    "browser/geolocation/CLLocation+XGeoHeaderTest.mm",
+    "browser/geolocation/location_manager_unittest.mm",
+    "browser/geolocation/omnibox_geolocation_local_state_unittest.mm",
+    "browser/install_time_util_unittest.mm",
+    "browser/installation_notifier_unittest.mm",
+    "browser/metrics/ios_chrome_metrics_service_accessor_unittest.cc",
+    "browser/metrics/ios_chrome_stability_metrics_provider_unittest.cc",
+    "browser/metrics/ios_stability_metrics_provider_unittest.mm",
+    "browser/metrics/previous_session_info_unittest.mm",
+    "browser/net/cookie_util_unittest.mm",
+    "browser/net/image_fetcher_unittest.mm",
+    "browser/net/metrics_network_client_unittest.mm",
+    "browser/net/retryable_url_fetcher_unittest.mm",
+    "browser/signin/chrome_identity_service_observer_bridge_unittest.mm",
+    "browser/signin/gaia_auth_fetcher_ios_unittest.mm",
+    "browser/snapshots/lru_cache_unittest.mm",
+    "browser/snapshots/snapshot_cache_unittest.mm",
+    "browser/snapshots/snapshots_util_unittest.mm",
+    "browser/translate/translate_service_ios_unittest.cc",
+    "browser/ui/commands/set_up_for_testing_command_unittest.mm",
+    "browser/ui/keyboard/UIKeyCommand+ChromeTest.mm",
+    "browser/ui/keyboard/hardware_keyboard_watcher_unittest.mm",
+    "browser/ui/native_content_controller_unittest.mm",
+    "browser/ui/ui_util_unittest.mm",
+    "browser/ui/uikit_ui_util_unittest.mm",
+    "browser/update_client/ios_chrome_update_query_params_delegate_unittest.cc",
+    "browser/web_resource/web_resource_util_unittest.cc",
+    "common/string_util_unittest.mm",
+  ]
+
+  deps = [
+    "//base",
+    "//base/test:test_support",
+    "//base:prefs_test_support",
+    "//components/bookmarks/test",
+    "//components/enhanced_bookmarks:test_support",
+    "//components/favicon_base",
+    "//components/metrics",
+    "//components/metrics:test_support",
+    "//components/signin/core/browser:test_support",
+    "//components/signin/ios/browser:test_support",
+    "//components/sync_driver:test_support",
+    "//components/update_client",
+    "//components/version_info",
+    "//ios/chrome/app",
+    "//ios/chrome/browser",
+    "//ios/chrome/browser:test_support",
+    "//ios/chrome/common",
+    "//ios/public/test",
+    "//ios/web",
+    "//ios/web:test_support",
+    "//net:test_support",
+    "//skia",
+    "//testing/gmock",
+    "//testing/gtest",
+    "//third_party/ocmock",
+    "//ui/gfx:test_support",
+  ]
+
+  # TODO(crbug.com/546283): once bundle resources are supported add code
+  # corresponding to the following gyp fragment:
+  #
+  # 'mac_bundle_resources': [
+  #   'browser/ui/native_content_controller_test.xib'
+  # ],
+  # 'actions': [
+  #   {
+  #     'action_name': 'copy_ios_chrome_test_data',
+  #     'variables': {
+  #       'test_data_files': [
+  #         'test/data/webdata/bookmarkimages',
+  #       ],
+  #       'test_data_prefix': 'ios/chrome',
+  #     },
+  #     'includes': [ '../../build/copy_test_data_ios.gypi' ]
+  #   },
+  # ],
+  # 'includes': ['ios_chrome_resources_bundle.gypi'],
+}