[Sync] Add new EnumSet class representing a set of enum values

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',
       'common/pref_names.cc',
@@ skipping 3277 matching lines @@
         'browser/sync/test/engine/mock_gaia_authenticator.cc',
         'browser/sync/test/engine/mock_gaia_authenticator.h',
         'browser/sync/test/engine/mock_gaia_authenticator_unittest.cc',
         'browser/sync/test/engine/syncer_command_test.cc',
         'browser/sync/test/engine/syncer_command_test.h',
         'browser/sync/test/engine/test_id_factory.h',
         'browser/sync/test/engine/test_syncable_utils.cc',
         'browser/sync/test/engine/test_syncable_utils.h',
         'browser/sync/test/sessions/test_scoped_session_event_listener.h',
         'browser/sync/util/data_encryption_unittest.cc',
+        'browser/sync/util/enum_set_unittest.cc',
         'browser/sync/util/extensions_activity_monitor_unittest.cc',
         'browser/sync/util/protobuf_unittest.cc',
         'browser/sync/util/immutable_unittest.cc',
         'browser/sync/util/weak_handle_unittest.cc',
       ],
       'include_dirs': [
         '..',
         '<(protoc_out_dir)',
       ],
       'defines' : [
@@ skipping 993 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],  # 'actions'
         },
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }