Update webkit_resources to support high-dpi assets

chrome/chrome_resources.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': {
     'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/chrome',
     'repack_locales_cmd': ['python', 'tools/build/repack_locales.py'],
   },
   'targets': [
     {
@@ skipping 231 matching lines @@
             },
           ],
         }],
         ['(OS != "mac" and enable_hidpi == 1) or chromeos == 1', {
           'copies': [
             {
               'destination': '<(PRODUCT_DIR)',
               'files': [
                 '<(grit_out_dir)/theme_resources_200_percent.pak',
                 '<(SHARED_INTERMEDIATE_DIR)/ui/ui_resources/ui_resources_200_percent.pak',
+                '<(SHARED_INTERMEDIATE_DIR)/webkit/webkit_resources_200_percent.pak',
               ],
             },
           ],
         }],
         ['enable_touch_ui==1', {
           'copies': [
             {
               'destination': '<(PRODUCT_DIR)',
               'files': [
                 '<(grit_out_dir)/theme_resources_touch_100_percent.pak',
@@ skipping 105 matching lines @@
                   'files': ['<@(default_apps_list)']
                 },
               ],
             }],
           ], # conditions
         }], # end OS != "mac"
       ], # conditions
     },
   ], # targets
 }