[Sync] Enable adding notifier observers from ProfileSyncService

chrome/chrome_tests.gypi

 # Copyright (c) 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' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 938 matching lines @@
         '../testing/gtest.gyp:gtest',
         'test_support_common',
         '../sync/sync.gyp:test_support_sync',
         '../sync/sync.gyp:test_support_sync_notifier',
         '../sync/sync.gyp:test_support_syncapi_core',
         '../sync/sync.gyp:test_support_syncapi_service',
         'test_support_unit',
         # 3) anything tests directly depend on
         '../skia/skia.gyp:skia',
         '../third_party/bzip2/bzip2.gyp:bzip2',
+        '../third_party/cacheinvalidation/cacheinvalidation.gyp:cacheinvalidation',
         '../third_party/cld/cld.gyp:cld',
         '../third_party/icu/icu.gyp:icui18n',
         '../third_party/icu/icu.gyp:icuuc',
         '../third_party/leveldatabase/leveldatabase.gyp:leveldatabase',
         '../third_party/libjingle/libjingle.gyp:libjingle',
         '../third_party/libxml/libxml.gyp:libxml',
         '../tools/json_schema_compiler/test/json_schema_compiler_tests.gyp:json_schema_compiler_tests',
         '../ui/gl/gl.gyp:gl',
         '../ui/ui.gyp:ui_resources',
         '../ui/ui.gyp:ui_test_support',
@@ skipping 3668 matching lines @@
                 '--result', '<@(_outputs)',
                 '--isolate', 'browser_tests.isolate',
               ],
             },
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }