Add BackupRollbackController for starting backup/rollback

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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 2138 matching lines @@
         'browser/status_icons/status_tray.cc',
         'browser/status_icons/status_tray.h',
         'browser/sxs_linux.cc',
         'browser/sxs_linux.h',
         'browser/sync/about_sync_util.cc',
         'browser/sync/about_sync_util.h',
         'browser/sync/backend_migrator.cc',
         'browser/sync/backend_migrator.h',
         'browser/sync/backend_unrecoverable_error_handler.cc',
         'browser/sync/backend_unrecoverable_error_handler.h',
+        'browser/sync/backup_rollback_controller.cc',
+        'browser/sync/backup_rollback_controller.h',
         'browser/sync/open_tabs_ui_delegate.cc',
         'browser/sync/open_tabs_ui_delegate.h',
         'browser/sync/glue/autofill_data_type_controller.cc',
         'browser/sync/glue/autofill_data_type_controller.h',
         'browser/sync/glue/autofill_profile_data_type_controller.cc',
         'browser/sync/glue/autofill_profile_data_type_controller.h',
         'browser/sync/glue/bookmark_change_processor.cc',
         'browser/sync/glue/bookmark_change_processor.h',
         'browser/sync/glue/bookmark_data_type_controller.cc',
         'browser/sync/glue/bookmark_data_type_controller.h',
@@ skipping 1541 matching lines @@
             'package_name': 'org/chromium/chrome/browser',
             'template_deps': ['browser/android/tab_load_status.h'],
           },
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
       ],
      },
     ],
   ],
 }