Introduce TabRestoreServiceClient and //chrome implementation.

chrome/chrome_browser.gypi

 # Copyright 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': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 2621 matching lines @@
       'browser/services/gcm/gcm_profile_service_factory.cc',
       'browser/services/gcm/gcm_profile_service_factory.h',
       'browser/services/gcm/instance_id/instance_id_profile_service.cc',
       'browser/services/gcm/instance_id/instance_id_profile_service.h',
       'browser/services/gcm/instance_id/instance_id_profile_service_factory.cc',
       'browser/services/gcm/instance_id/instance_id_profile_service_factory.h',
     ],
     'chrome_browser_session_sources': [
       'browser/sessions/base_session_service_delegate_impl.cc',
       'browser/sessions/base_session_service_delegate_impl.h',
+      'browser/sessions/chrome_tab_restore_service_client.cc',
+      'browser/sessions/chrome_tab_restore_service_client.h',
       'browser/sessions/session_data_deleter.cc',
       'browser/sessions/session_data_deleter.h',
       'browser/sessions/session_restore_android.cc',
       'browser/sessions/session_tab_helper.cc',
       'browser/sessions/session_tab_helper.h',
       'browser/sessions/tab_restore_service.cc',
       'browser/sessions/tab_restore_service.h',
       'browser/sessions/tab_restore_service_factory.cc',
       'browser/sessions/tab_restore_service_factory.h',
       'browser/sessions/tab_restore_service_helper.cc',
@@ skipping 1491 matching lines @@
             '../components/components.gyp:omnibox_browser',
             '../components/components.gyp:rlz',
             '../components/components.gyp:search_engines',
             '../rlz/rlz.gyp:rlz_lib',
           ],
         },
       ],
     }],
   ],
 }