Add SyncAuthProvider interface and implementation

chrome/chrome_tests_unit.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': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
       'type': 'static_library',
@@ skipping 1310 matching lines @@
         'browser/sync/glue/shared_change_processor_unittest.cc',
         'browser/sync/glue/sync_backend_host_impl_unittest.cc',
         'browser/sync/glue/sync_backend_host_mock.cc',
         'browser/sync/glue/sync_backend_host_mock.h',
         'browser/sync/glue/sync_backend_registrar_unittest.cc',
         'browser/sync/glue/synced_device_tracker_unittest.cc',
         'browser/sync/glue/synced_session_tracker_unittest.cc',
         'browser/sync/glue/typed_url_model_associator_unittest.cc',
         'browser/sync/glue/ui_data_type_controller_unittest.cc',
         'browser/sync/glue/ui_model_worker_unittest.cc',
+        'browser/sync/profile_sync_auth_provider_unittest.cc',
         'browser/sync/profile_sync_components_factory_impl_unittest.cc',
         'browser/sync/profile_sync_components_factory_mock.cc',
         'browser/sync/profile_sync_components_factory_mock.h',
         'browser/sync/profile_sync_service_autofill_unittest.cc',
         'browser/sync/profile_sync_service_bookmark_unittest.cc',
         'browser/sync/profile_sync_service_startup_unittest.cc',
         'browser/sync/profile_sync_service_typed_url_unittest.cc',
         'browser/sync/profile_sync_service_unittest.cc',
         'browser/sync/profile_sync_test_util.cc',
         'browser/sync/profile_sync_test_util.h',
@@ skipping 1512 matching lines @@
             'browser/ui/app_list/test/fake_profile_store.h',
             'browser/ui/app_list/test/fast_show_pickler_unittest.cc',
             'browser/ui/views/app_list/linux/app_list_linux_unittest.cc',
             'browser/ui/views/app_list/win/app_list_win_unittest.cc',
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }