Extract WebWidgetTestClient out of WebTestProxyBase and WebViewTestClient.

components/test_runner/test_runner.gyp

 # Copyright 2015 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': {
     # This turns on e.g. the filename-based detection of which
     # platforms to include source files on (e.g. files ending in
     # _mac.h or _mac.cc are only compiled on MacOSX).
     'chromium_code': 1,
@@ skipping 106 matching lines @@
         'web_task.cc',
         'web_task.h',
         'web_test_delegate.h',
         'web_test_interfaces.cc',
         'web_test_interfaces.h',
         'web_test_proxy.cc',
         'web_test_proxy.h',
         'web_test_runner.h',
         'web_view_test_client.cc',
         'web_view_test_client.h',
+        'web_widget_test_client.cc',
+        'web_widget_test_client.h',
       ],
       'msvs_settings': {
         'VCLinkerTool': {
           'SubSystem': '2',  # Set /SUBSYSTEM:WINDOWS
         },
       },
       'conditions': [
         ['OS=="win"', {
           'configurations': {
             'Debug_Base': {
@@ skipping 72 matching lines @@
                   '$(SDKROOT)/System/Library/Frameworks/AppKit.framework',
                 ],
               },
             }],
           ],
         },
       ],
     }],  # OS=="mac" or OS=="win"
   ]
 }