Start adding gn build for android_webview

android_webview/native/webview_native.gyp

 # Copyright (c) 2012 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: //android_webview/native:native
       'target_name': 'webview_native',
       'type': 'static_library',
       'dependencies': [
         '../../base/base.gyp:base_static',
         '../../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
         '../../cc/cc.gyp:cc',
         '../../components/components.gyp:autofill_content_browser',
         '../../components/components.gyp:devtools_http_handler',
         '../../components/components.gyp:web_contents_delegate_android',
         '../../content/content.gyp:content_common',
@@ skipping 87 matching lines @@
       ],
       'conditions': [
         ['video_hole==1', {
           'dependencies': [
             '../../components/components.gyp:external_video_surface',
           ],
         }],
       ],
     },
     {
+      # GN version:  //android_webview/native:cancellation_signal_android_jar_jni_headers' 
       'target_name': 'cancellation_signal_android_jar_jni_headers',
       'type': 'none',
       'variables': {
         'jni_gen_package': 'android_webview',
         'input_java_class': 'android/os/CancellationSignal.class',
       },
       'includes': [ '../../build/jar_file_jni_generator.gypi' ],
     },
     {
+      # GN version:  //android_webview/native:native_jni 
       'target_name': 'android_webview_native_jni',
       'type': 'none',
       'sources': [
           '../java/src/org/chromium/android_webview/AndroidProtocolHandler.java',
           '../java/src/org/chromium/android_webview/AwAutofillClient.java',
           '../java/src/org/chromium/android_webview/AwContents.java',
           '../java/src/org/chromium/android_webview/AwContentsBackgroundThreadClient.java',
           '../java/src/org/chromium/android_webview/AwContentsClientBridge.java',
           '../java/src/org/chromium/android_webview/AwContentsIoThreadClient.java',
           '../java/src/org/chromium/android_webview/AwContentsStatics.java',
@@ skipping 15 matching lines @@
           '../java/src/org/chromium/android_webview/permission/AwPermissionRequest.java',
       ],
       'variables': {
         'jni_gen_package': 'android_webview',
       },
       'includes': [ '../../build/jni_generator.gypi' ],
       'dependencies': [
         'cancellation_signal_android_jar_jni_headers',
       ],
     },
+    # GN version:  //android_webview/native:aw_permission_request_resource' 
     {
       'target_name': 'android_webview_aw_permission_request_resource',
       'type': 'none',
       'variables': {
         'source_file': 'permission/aw_permission_request.h',
       },
       'includes': [ '../../build/android/java_cpp_enum.gypi' ],
     },
   ],
 }