Add SyncAuthProvider interface and 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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 2231 matching lines @@
         'browser/sync/glue/typed_url_data_type_controller.cc',
         'browser/sync/glue/typed_url_data_type_controller.h',
         'browser/sync/glue/typed_url_model_associator.cc',
         'browser/sync/glue/typed_url_model_associator.h',
         'browser/sync/glue/ui_data_type_controller.cc',
         'browser/sync/glue/ui_data_type_controller.h',
         'browser/sync/glue/ui_model_worker.cc',
         'browser/sync/glue/ui_model_worker.h',
         'browser/sync/managed_user_signin_manager_wrapper.cc',
         'browser/sync/managed_user_signin_manager_wrapper.h',
+        'browser/sync/profile_sync_auth_provider.cc',
+        'browser/sync/profile_sync_auth_provider.h',
         'browser/sync/profile_sync_components_factory.h',
         'browser/sync/profile_sync_components_factory_impl.cc',
         'browser/sync/profile_sync_components_factory_impl.h',
         'browser/sync/profile_sync_service.cc',
         'browser/sync/profile_sync_service.h',
         'browser/sync/profile_sync_service_android.cc',
         'browser/sync/profile_sync_service_android.h',
         'browser/sync/profile_sync_service_base.h',
         'browser/sync/profile_sync_service_base.cc',
         'browser/sync/profile_sync_service_factory.cc',
@@ skipping 1458 matching lines @@
             'package_name': 'org/chromium/chrome/browser',
             'template_deps': ['browser/android/tab_load_status.h'],
           },
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
       ],
      },
     ],
   ],
 }