[Sync] Split DirectoryChangeListener for thread-safety

chrome/chrome_tests.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.
 
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
@@ skipping 278 matching lines @@
         '../testing/gmock.gyp:gmock',
         '../testing/gtest.gyp:gtest',
         'sync',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         'browser/sync/js_test_util.cc',
         'browser/sync/js_test_util.h',
+        'test/sync/null_directory_change_delegate.cc',
+        'test/sync/null_directory_change_delegate.h',
         'test/sync/engine/test_directory_setter_upper.cc',
         'test/sync/engine/test_directory_setter_upper.h',
       ],
     },
     {
       'target_name': 'test_support_syncapi',
       'type': 'static_library',
       'dependencies': [
         '../base/base.gyp:base',
         'syncapi_core',
@@ skipping 3821 matching lines @@
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }
 
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 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: