Add Worker support for FileSystem API.

chrome/chrome_common.gypi

 # Copyright (c) 2010 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.
 
 {
   'target_defaults': {
     'variables': {
       'chrome_common_target': 0,
     },
     'target_conditions': [
@@ skipping 34 matching lines @@
           'common/content_settings.cc',
           'common/content_settings.h',
           'common/content_settings_helper.cc',
           'common/content_settings_helper.h',
           'common/content_settings_types.h',
           'common/debug_flags.cc',
           'common/debug_flags.h',
           'common/devtools_messages.cc',
           'common/devtools_messages.h',
           'common/devtools_messages_internal.h',
+          'common/file_system/webfilesystem_callback_dispatcher.cc',
+          'common/file_system/webfilesystem_callback_dispatcher.h',
           'common/file_system/webfilesystem_impl.cc',
           'common/file_system/webfilesystem_impl.h',
           'common/font_descriptor_mac.h',
           'common/font_descriptor_mac.mm',
           'common/geoposition.cc',
           'common/geoposition.h',
           'common/gpu_info.h',
           'common/gpu_info.cc',
           'common/gpu_messages.cc',
           'common/gpu_messages.h',
@@ skipping 444 matching lines @@
           'configurations': {
             'Common_Base': {
               'msvs_target_platform': 'x64',
             },
           },
         },
       ],
     }],
   ],
 }