Add gn implementation for //components/translate/ios/browser.

components/translate.gypi

 # Copyright 2013 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.
 
 {
   'targets': [
     {
       # GN version: //components/translate/core/browser
       'target_name': 'translate_core_browser',
       'type': 'static_library',
@@ skipping 215 matching lines @@
                 'translate/content/renderer/data_file_renderer_cld_data_provider.h',
               ],
             }],
           ],
         },
       ],
     }],
     ['OS == "ios"', {
       'targets': [
         {
+          # GN version: //components/translate/ios/browser
           'target_name': 'translate_ios_browser',
           'type': 'static_library',
           'include_dirs': [
             '..',
           ],
           'dependencies': [
             'translate_core_language_detection',
             'translate_core_browser',
             'translate_core_common',
             'translate_ios_injected_js',
             '../base/base.gyp:base',
             '../ios/web/ios_web.gyp:ios_web',
             '../url/url.gyp:url_lib',
           ],
           'sources': [
             'translate/ios/browser/ios_translate_driver.h',
             'translate/ios/browser/ios_translate_driver.mm',
             'translate/ios/browser/js_language_detection_manager.h',
             'translate/ios/browser/js_language_detection_manager.mm',
             'translate/ios/browser/js_translate_manager.h',
             'translate/ios/browser/js_translate_manager.mm',
             'translate/ios/browser/language_detection_controller.h',
             'translate/ios/browser/language_detection_controller.mm',
             'translate/ios/browser/translate_controller.h',
             'translate/ios/browser/translate_controller.mm',
           ],
         },
         {
+          # GN version: //components/translate/ios/browser:injected_js
           'target_name': 'translate_ios_injected_js',
           'type': 'none',
           'sources': [
             'translate/ios/browser/resources/language_detection.js',
             'translate/ios/browser/resources/translate_ios.js',
           ],
           'link_settings': {
             'mac_bundle_resources': [
               '<(SHARED_INTERMEDIATE_DIR)/translate_ios.js',
               '<(SHARED_INTERMEDIATE_DIR)/language_detection.js',
             ],
           },
           'includes': [
             '../ios/web/js_compile_checked.gypi',
           ],
         },
       ],
     }],
   ],
 }