sync_unit_tests: add test for unknown field retention.

chrome/chrome_tests.gypi

 # Copyright (c) 2010 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_dll_resource.h',
       'common/pref_names.cc',
       'common/pref_names.h',
@@ skipping 2250 matching lines @@
               ],
             }],
           ],
         }], # OS="win"
       ], # conditions
     },
     {
       'target_name': 'sync_unit_tests',
       'type': 'executable',
       'sources': [
+        '<(protoc_out_dir)/chrome/browser/sync/protocol/test.pb.cc',
         'app/breakpad_mac_stubs.mm',
         'browser/sync/engine/apply_updates_command_unittest.cc',
         'browser/sync/engine/clear_data_command_unittest.cc',
         'browser/sync/engine/cleanup_disabled_types_command_unittest.cc',
         'browser/sync/engine/download_updates_command_unittest.cc',
         'browser/sync/engine/mock_model_safe_workers.h',
         'browser/sync/engine/process_commit_response_command_unittest.cc',
         'browser/sync/engine/syncapi_unittest.cc',
         'browser/sync/engine/syncer_proto_util_unittest.cc',
         'browser/sync/engine/syncer_thread_unittest.cc',
         'browser/sync/engine/syncer_unittest.cc',
         'browser/sync/engine/syncproto_unittest.cc',
         'browser/sync/engine/verify_updates_command_unittest.cc',
         'browser/sync/glue/change_processor_mock.h',
         'browser/sync/notifier/chrome_system_resources_unittest.cc',
         'browser/sync/notifier/registration_manager_unittest.cc',
         'browser/sync/profile_sync_factory_mock.cc',
         'browser/sync/profile_sync_factory_mock.h',
         'browser/sync/sessions/ordered_commit_set_unittest.cc',
         'browser/sync/sessions/status_controller_unittest.cc',
         'browser/sync/sessions/sync_session_unittest.cc',
         'browser/sync/syncable/directory_backing_store_unittest.cc',
         'browser/sync/syncable/syncable_id_unittest.cc',
         'browser/sync/syncable/syncable_unittest.cc',
         'browser/sync/util/channel_unittest.cc',
         'browser/sync/util/crypto_helpers_unittest.cc',
         'browser/sync/util/data_encryption_unittest.cc',
         'browser/sync/util/extensions_activity_monitor_unittest.cc',
+        'browser/sync/util/protobuf_unittest.cc',
         'browser/sync/util/user_settings_unittest.cc',
         'test/file_test_utils.cc',
         'test/sync/engine/mock_connection_manager.cc',
         'test/sync/engine/mock_connection_manager.h',
         'test/sync/engine/mock_gaia_authenticator.cc',
         'test/sync/engine/mock_gaia_authenticator.h',
         'test/sync/engine/mock_gaia_authenticator_unittest.cc',
         'test/sync/engine/syncer_command_test.h',
         'test/sync/engine/test_directory_setter_upper.cc',
         'test/sync/engine/test_directory_setter_upper.h',
@@ skipping 719 matching lines @@
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: