Implement AutomationNode.querySelector().

extensions/extensions.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 804 matching lines @@
         '../mojo/public/mojo_public.gyp:mojo_js_bindings',
         '../third_party/WebKit/public/blink.gyp:blink',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         # Note: sources list duplicated in GN build.
         'renderer/activity_log_converter_strategy.cc',
         'renderer/activity_log_converter_strategy.h',
+        'renderer/api/automation/automation_api_helper.cc',
+        'renderer/api/automation/automation_api_helper.h',
         'renderer/api_activity_logger.cc',
         'renderer/api_activity_logger.h',
         'renderer/api_definitions_natives.cc',
         'renderer/api_definitions_natives.h',
         'renderer/app_runtime_custom_bindings.cc',
         'renderer/app_runtime_custom_bindings.h',
         'renderer/app_window_custom_bindings.cc',
         'renderer/app_window_custom_bindings.h',
         'renderer/binding_generating_native_handler.cc',
         'renderer/binding_generating_native_handler.h',
@@ skipping 384 matching lines @@
       'conditions': [
         ['OS=="win" and win_use_allocator_shim==1', {
           'dependencies': [
             '../base/allocator/allocator.gyp:allocator',
           ],
         }],
       ],
     },
   ]
 }