sync: Add interfaces for per-type sync

sync/sync_tests.gypi

 # Copyright 2013 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': [
     # Test support files for the 'sync_core' target.
     {
       'target_name': 'test_support_sync_core',
       'type': 'static_library',
@@ skipping 22 matching lines @@
         'js/js_test_util.h',
         'sessions/test_util.cc',
         'sessions/test_util.h',
         'test/callback_counter.h',
         'test/engine/fake_model_worker.cc',
         'test/engine/fake_model_worker.h',
         'test/engine/fake_sync_scheduler.cc',
         'test/engine/fake_sync_scheduler.h',
         'test/engine/mock_connection_manager.cc',
         'test/engine/mock_connection_manager.h',
+        'test/engine/mock_update_handler.cc',
+        'test/engine/mock_update_handler.h',
         'test/engine/test_directory_setter_upper.cc',
         'test/engine/test_directory_setter_upper.h',
         'test/engine/test_id_factory.h',
         'test/engine/test_syncable_utils.cc',
         'test/engine/test_syncable_utils.h',
         'test/fake_encryptor.cc',
         'test/fake_encryptor.h',
         'test/fake_sync_encryption_handler.cc',
         'test/fake_sync_encryption_handler.h',
         'test/null_directory_change_delegate.cc',
@@ skipping 211 matching lines @@
           'internal_api/public/base/enum_set_unittest.cc',
           'internal_api/public/base/node_ordinal_unittest.cc',
           'internal_api/public/base/ordinal_unittest.cc',
           'internal_api/public/base/unique_position_unittest.cc',
           'internal_api/public/engine/model_safe_worker_unittest.cc',
           'internal_api/public/util/immutable_unittest.cc',
           'internal_api/public/util/weak_handle_unittest.cc',
           'engine/apply_control_data_updates_unittest.cc',
           'engine/backoff_delay_provider_unittest.cc',
           'engine/download_unittest.cc',
-          'engine/sync_directory_commit_contribution_unittest.cc',
-          'engine/sync_directory_update_handler_unittest.cc',
+          'engine/directory_commit_contribution_unittest.cc',
+          'engine/directory_update_handler_unittest.cc',
           'engine/sync_scheduler_unittest.cc',
           'engine/syncer_proto_util_unittest.cc',
           'engine/syncer_unittest.cc',
           'engine/traffic_recorder_unittest.cc',
           'js/js_arg_list_unittest.cc',
           'js/js_event_details_unittest.cc',
           'js/sync_js_controller_unittest.cc',
           'protocol/proto_enum_conversions_unittest.cc',
           'protocol/proto_value_conversions_unittest.cc',
           'sessions/model_type_registry_unittest.cc',
@@ skipping 366 matching lines @@
           'variables': {
             'test_suite_name': 'sync_unit_tests',
             'input_shlib_path': '<(SHARED_LIB_DIR)/<(SHARED_LIB_PREFIX)sync_unit_tests<(SHARED_LIB_SUFFIX)',
           },
           'includes': [ '../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }