Add sync_callbacks.h for Sync FileSystem callbacks.

webkit/fileapi/webkit_fileapi.gypi

 # 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': {
     'webkit_fileapi_sources': [
       '../fileapi/file_observers.h',
       '../fileapi/file_stream_writer.h',
       '../fileapi/file_system_callback_dispatcher.cc',
@@ skipping 68 matching lines @@
       '../fileapi/sandbox_quota_observer.cc',
       '../fileapi/sandbox_quota_observer.h',
       '../fileapi/syncable/file_change.cc',
       '../fileapi/syncable/file_change.h',
       '../fileapi/syncable/local_file_change_tracker.cc',
       '../fileapi/syncable/local_file_change_tracker.h',
       '../fileapi/syncable/local_file_sync_context.cc',
       '../fileapi/syncable/local_file_sync_context.h',
       '../fileapi/syncable/local_file_sync_status.cc',
       '../fileapi/syncable/local_file_sync_status.h',
+      '../fileapi/syncable/sync_callbacks.h',
       '../fileapi/syncable/sync_status_code.cc',
       '../fileapi/syncable/sync_status_code.h',
       '../fileapi/syncable/syncable_file_operation_runner.cc',
       '../fileapi/syncable/syncable_file_operation_runner.h',
       '../fileapi/syncable/syncable_file_system_operation.cc',
       '../fileapi/syncable/syncable_file_system_operation.h',
       '../fileapi/syncable/syncable_file_system_util.cc',
       '../fileapi/syncable/syncable_file_system_util.h',
       '../fileapi/task_runner_bound_observer_list.h',
       '../fileapi/test_mount_point_provider.cc',
@@ skipping 16 matching lines @@
     ],
     'webkit_fileapi_media_sources': [
       '../fileapi/media/device_media_file_util.cc',
       '../fileapi/media/device_media_file_util.h',
       '../fileapi/media/mtp_device_delegate.h',
       '../fileapi/media/mtp_device_map_service.cc',
       '../fileapi/media/mtp_device_map_service.h',
     ],
   },
 }