Start adding gn build for android_webview

android_webview/android_webview.gyp

 # Copyright 2009 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,
     'system_webview_package_name%': 'com.android.webview',
   },
   'targets': [
     {
@@ skipping 106 matching lines @@
         'locale_pak_files': [
           '<@(webview_locales_input_common_paks)',
           '<@(webview_locales_input_individual_paks)',
         ],
       },
       'includes': [
         '../build/android/locale_pak_resources.gypi',
       ],
     },
     {
+      # GN version:  //android_webview:strings_grd
       'target_name': 'android_webview_strings_grd',
       'android_unmangled_name': 1,
       'type': 'none',
       'variables': {
         'grd_file': '../android_webview/java/strings/android_webview_strings.grd',
       },
       'includes': [
           '../build/java_strings_grd.gypi',
       ],
     },
     {
+      # GN version:  //android_webview/common:version 
       'target_name': 'android_webview_version',
       'type': 'none',
       'direct_dependent_settings': {
         'include_dirs': [
           '<(SHARED_INTERMEDIATE_DIR)',
         ],
       },
       # Because generate_version generates a header, we must set the
       # hard_dependency flag.
       'hard_dependency': 1,
@@ skipping 228 matching lines @@
         'renderer/print_render_frame_observer.h',
       ],
     },
     {
       'target_name': 'libwebviewchromium',
       'includes': [
           'libwebviewchromium.gypi',
       ],
     },
     {
+      # GN version:  //android_webview:android_webview_java
       'target_name': 'android_webview_java',
       'type': 'none',
       'dependencies': [
         '../android_webview/native/webview_native.gyp:android_webview_aw_permission_request_resource',
         '../components/components.gyp:external_video_surface_java',
         '../components/components.gyp:navigation_interception_java',
         '../components/components.gyp:policy_java',
         '../components/components.gyp:web_contents_delegate_android_java',
         '../content/content.gyp:content_java',
         '../ui/android/ui_android.gyp:ui_java',
@@ skipping 30 matching lines @@
         'android_manifest_template_vars': ['package=<(system_webview_package_name)'],
       },
       'includes': [ 'apk/system_webview_apk_common.gypi' ],
     },
   ],
   'includes': [
     'android_webview_tests.gypi',
     'apk/system_webview_paks.gypi',
   ],
 }