[Sync] Initial USS service implementation for DeviceInfo.

components/sync_driver.gypi

 # Copyright 2014 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': [
     {
       # GN version: //components/sync_driver
       'target_name': 'sync_driver',
       'type': 'static_library',
@@ skipping 35 matching lines @@
         'sync_driver/data_type_manager.h',
         'sync_driver/data_type_manager_impl.cc',
         'sync_driver/data_type_manager_impl.h',
         'sync_driver/data_type_manager_observer.h',
         'sync_driver/data_type_status_table.cc',
         'sync_driver/data_type_status_table.h',
         'sync_driver/device_info.cc',
         'sync_driver/device_info.h',
         'sync_driver/device_info_data_type_controller.cc',
         'sync_driver/device_info_data_type_controller.h',
+        'sync_driver/device_info_service.cc',
+        'sync_driver/device_info_service.h',
         'sync_driver/device_info_sync_service.cc',
         'sync_driver/device_info_sync_service.h',
         'sync_driver/device_info_tracker.h',
         'sync_driver/directory_data_type_controller.cc',
         'sync_driver/directory_data_type_controller.h',
         'sync_driver/favicon_cache.cc',
         'sync_driver/favicon_cache.h',
         'sync_driver/frontend_data_type_controller.cc',
         'sync_driver/frontend_data_type_controller.h',
         'sync_driver/generic_change_processor.cc',
@@ skipping 136 matching lines @@
         'sync_driver/non_frontend_data_type_controller_mock.cc',
         'sync_driver/non_frontend_data_type_controller_mock.h',
         'sync_driver/non_ui_data_type_controller_mock.cc',
         'sync_driver/non_ui_data_type_controller_mock.h',
         'sync_driver/sync_api_component_factory_mock.cc',
         'sync_driver/sync_api_component_factory_mock.h',
       ],
     },
   ],
 }