Add skeleton code to wire Local- and Remote- file sync services

chrome/chrome_browser.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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
@@ skipping 1924 matching lines @@
         'browser/sync/sync_global_error.h',
         'browser/sync/sync_prefs.cc',
         'browser/sync/sync_prefs.h',
         'browser/sync/sync_ui_util.cc',
         'browser/sync/sync_ui_util.h',
         'browser/sync/sync_ui_util_mac.h',
         'browser/sync/sync_ui_util_mac.mm',
         'browser/sync/user_selectable_sync_type.h',
         'browser/sync_file_system/drive_metadata_store.cc',
         'browser/sync_file_system/drive_metadata_store.h',
+        'browser/sync_file_system/change_observer_interface.h',
+        'browser/sync_file_system/local_change_processor.h',
         'browser/sync_file_system/local_file_sync_service.cc',
         'browser/sync_file_system/local_file_sync_service.h',
+        'browser/sync_file_system/remote_change_processor.h',
         'browser/sync_file_system/sync_file_system_service.cc',
         'browser/sync_file_system/sync_file_system_service.h',
         'browser/system_monitor/disk_info_mac.h',
         'browser/system_monitor/disk_info_mac.mm',
         'browser/system_monitor/media_device_notifications_utils.cc',
         'browser/system_monitor/media_device_notifications_utils.h',
         'browser/system_monitor/media_storage_util.cc',
         'browser/system_monitor/media_storage_util.h',
         'browser/system_monitor/media_transfer_protocol_device_observer_linux.cc',
         'browser/system_monitor/media_transfer_protocol_device_observer_linux.h',
@@ skipping 945 matching lines @@
             'proto_in_dir': '../third_party/cros_system_api/dbus',
             'proto_out_dir': 'chrome/browser/media_transfer_protocol',
           },
           'includes': ['../build/protoc.gypi'],
         },
       ],
      },
     ],
   ],
 }