Enable sync for the settings from the Extension Settings API.

chrome/chrome_browser.gypi

 # Copyright (c) 2011 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',
       'dependencies': [
@@ skipping 1035 matching lines @@
         'browser/extensions/extension_protocols.cc',
         'browser/extensions/extension_protocols.h',
         'browser/extensions/extension_proxy_api.cc',
         'browser/extensions/extension_proxy_api.h',
         'browser/extensions/extension_proxy_api_constants.cc',
         'browser/extensions/extension_proxy_api_constants.h',
         'browser/extensions/extension_proxy_api_helpers.cc',
         'browser/extensions/extension_proxy_api_helpers.h',
         'browser/extensions/extension_rlz_module.cc',
         'browser/extensions/extension_rlz_module.h',
+        'browser/extensions/extension_setting_sync_data.cc',
+        'browser/extensions/extension_setting_sync_data.h',
         'browser/extensions/extension_settings.cc',
         'browser/extensions/extension_settings.h',
         'browser/extensions/extension_settings_api.cc',
         'browser/extensions/extension_settings_api.h',
         'browser/extensions/extension_settings_noop_storage.cc',
         'browser/extensions/extension_settings_noop_storage.h',
         'browser/extensions/extension_settings_storage.h',
         'browser/extensions/extension_settings_storage_cache.cc',
         'browser/extensions/extension_settings_storage_cache.h',
         'browser/extensions/extension_settings_leveldb_storage.cc',
         'browser/extensions/extension_settings_leveldb_storage.h',
+        'browser/extensions/extension_settings_sync_helper.cc',
+        'browser/extensions/extension_settings_sync_helper.h',
         'browser/extensions/extension_service.cc',
         'browser/extensions/extension_service.h',
         'browser/extensions/extension_sidebar_api.cc',
         'browser/extensions/extension_sidebar_api.h',
         'browser/extensions/extension_special_storage_policy.cc',
         'browser/extensions/extension_special_storage_policy.h',
         'browser/extensions/extension_sync_data.cc',
         'browser/extensions/extension_sync_data.h',
         'browser/extensions/extension_tab_helper.cc',
         'browser/extensions/extension_tab_helper.h',
@@ skipping 67 matching lines @@
         'browser/extensions/key_identifier_conversion_views.cc',
         'browser/extensions/key_identifier_conversion_views.h',
         'browser/extensions/pack_extension_job.cc',
         'browser/extensions/pack_extension_job.h',
         'browser/extensions/pending_extension_info.cc',
         'browser/extensions/pending_extension_info.h',
         'browser/extensions/pending_extension_manager.cc',
         'browser/extensions/pending_extension_manager.h',
         'browser/extensions/sandboxed_extension_unpacker.cc',
         'browser/extensions/sandboxed_extension_unpacker.h',
+        'browser/extensions/syncable_extension_settings_storage.cc',
+        'browser/extensions/syncable_extension_settings_storage.h',
         'browser/extensions/theme_installed_infobar_delegate.cc',
         'browser/extensions/theme_installed_infobar_delegate.h',
         'browser/extensions/user_script_listener.cc',
         'browser/extensions/user_script_listener.h',
         'browser/extensions/user_script_master.cc',
         'browser/extensions/user_script_master.h',
         'browser/extensions/webstore_install_helper.cc',
         'browser/extensions/webstore_install_helper.h',
         'browser/external_protocol/external_protocol_handler.cc',
         'browser/external_protocol/external_protocol_handler.h',
@@ skipping 888 matching lines @@
         'browser/sync/glue/data_type_manager.cc',
         'browser/sync/glue/data_type_manager.h',
         'browser/sync/glue/data_type_manager_impl.cc',
         'browser/sync/glue/data_type_manager_impl.h',
         'browser/sync/glue/database_model_worker.cc',
         'browser/sync/glue/database_model_worker.h',
         'browser/sync/glue/do_optimistic_refresh_task.cc',
         'browser/sync/glue/do_optimistic_refresh_task.h',
         'browser/sync/glue/extension_data_type_controller.cc',
         'browser/sync/glue/extension_data_type_controller.h',
+        'browser/sync/glue/extension_setting_data_type_controller.cc',
+        'browser/sync/glue/extension_setting_data_type_controller.h',
         'browser/sync/glue/frontend_data_type_controller.cc',
         'browser/sync/glue/frontend_data_type_controller.h',
         'browser/sync/glue/generic_change_processor.cc',
         'browser/sync/glue/generic_change_processor.h',
         'browser/sync/glue/history_model_worker.cc',
         'browser/sync/glue/history_model_worker.h',
         'browser/sync/glue/http_bridge.cc',
         'browser/sync/glue/http_bridge.h',
         'browser/sync/glue/model_associator.h',
         'browser/sync/glue/non_frontend_data_type_controller.cc',
@@ skipping 2816 matching lines @@
               # weak imports in dependents, who still must #include
               # closure_blocks_leopard_compat.h to get weak imports.
               'type': 'none',
             }],
           ],
         },
       ],
     }],
   ],
 }