Add support for building "ios_chrome_unittests" with gn.

ios/chrome/ios_chrome.gyp

 # Copyright 2014 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
+      # GN version: //ios/chrome/app
       'target_name': 'ios_chrome_app',
       'type': 'static_library',
       'include_dirs': [
         '../..',
       ],
       'dependencies': [
         '../../base/base.gyp:base',
         'ios_chrome_browser',
       ],
       'link_settings': {
         'libraries': [
           '$(SDKROOT)/System/Library/Frameworks/Foundation.framework',
           '$(SDKROOT)/System/Library/Frameworks/UIKit.framework',
         ],
       },
       'sources': [
         'app/UIApplication+ExitsOnSuspend.h',
         'app/UIApplication+ExitsOnSuspend.mm',
         'app/deferred_initialization_runner.h',
         'app/deferred_initialization_runner.mm',
         'app/safe_mode_crashing_modules_config.h',
         'app/safe_mode_crashing_modules_config.mm',
         'app/safe_mode_util.cc',
         'app/safe_mode_util.h',
       ],
     },
     {
+      # GN version: //ios/chrome/browser
       'target_name': 'ios_chrome_browser',
       'type': 'static_library',
       'include_dirs': [
         '../..',
       ],
       'dependencies': [
         '../../base/base.gyp:base',
         '../../base/base.gyp:base_prefs',
         '../../breakpad/breakpad.gyp:breakpad_client',
         '../../components/components.gyp:autofill_core_browser',
@@ skipping 514 matching lines @@
         }],
         ['configuration_policy==1', {
           'dependencies': [
             '../../components/components.gyp:policy_component_browser',
             '../../components/components.gyp:policy_component_common',
           ],
         }],
       ],
     },
     {
+      # GN version: //ios/chrome/common
       'target_name': 'ios_chrome_common',
       'type': 'static_library',
       'include_dirs': [
         '../..',
       ],
       'dependencies': [
         '../../base/base.gyp:base',
         '../../components/components.gyp:version_info',
         'app_group_mainapp',
       ],
       'link_settings': {
         'libraries': [
           '$(SDKROOT)/System/Library/Frameworks/CoreGraphics.framework',
           '$(SDKROOT)/System/Library/Frameworks/Foundation.framework',
         ],
       },
       'sources': [
         'common/channel_info.h',
         'common/channel_info.mm',
         'common/string_util.h',
         'common/string_util.mm',
       ],
     },
     {
+      # GN version: //ios/chrome/browser:injected_js
       'target_name': 'injected_js',
       'type': 'none',
       'sources': [
         'browser/find_in_page/resources/find_in_page.js',
       ],
       'includes': [ '../../ios/web/js_compile.gypi' ],
       'link_settings': {
         'mac_bundle_resources': [
           '<(SHARED_INTERMEDIATE_DIR)/find_in_page.js',
         ],
       },
     },
     {
+      # GN version: //ios/chrome/common/app_group
       'target_name': 'app_group_common',
       'type': 'static_library',
       'sources': [
         'common/app_group/app_group_constants.h',
         'common/app_group/app_group_constants.mm',
         'common/app_group/app_group_metrics.h',
         'common/app_group/app_group_metrics.mm',
       ],
       'dependencies': [
         # This target will be included into application extensions and the list
         # of its dependencies must be kept as short as possible.
         '../../base/base.gyp:base',
         '../../components/components.gyp:version_info',
       ],
       'include_dirs': [
         '../..',
       ],
     },
     {
+      # GN version: //ios/chrome/common/app_group:client
       'target_name': 'app_group_client',
       'type': 'static_library',
       'sources': [
         'common/app_group/app_group_metrics_client.h',
         'common/app_group/app_group_metrics_client.mm',
       ],
       'dependencies': [
         # This target will be included into application extensions and the list
         # of its dependencies must be kept as short as possible.
         'app_group_common',
       ],
       'include_dirs': [
         '../..',
       ],
     },
     {
+      # GN version: //ios/chrome/common/app_group:main_app
       'target_name': 'app_group_mainapp',
       'type': 'static_library',
       'sources': [
         'common/app_group/app_group_metrics_mainapp.h',
         'common/app_group/app_group_metrics_mainapp.mm',
       ],
       'dependencies': [
         'app_group_common',
       ],
       'include_dirs': [
         '../..',
       ],
     },
   ],
   'conditions': [
     ['enable_rlz_support==1', {
       'targets': [
         {
+          # GN version: //ios/chrome/browser/rlz
           'target_name': 'ios_chrome_browser_rlz',
           'type': 'static_library',
           'sources': [
             'browser/rlz/rlz_tracker_delegate_impl.cc',
             'browser/rlz/rlz_tracker_delegate_impl.h',
           ],
           'dependencies': [
             '../../components/components.gyp:google_core_browser',
             '../../components/components.gyp:omnibox_browser',
             '../../components/components.gyp:rlz',
             '../../components/components.gyp:search_engines',
             '../../rlz/rlz.gyp:rlz_lib',
           ],
         },
       ],
     }],
   ],
 }