Add code for new invalidation local ack system

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 101 matching lines @@
       ],
       'sources': [
         'notifier/fake_invalidation_handler.cc',
         'notifier/fake_invalidation_handler.h',
         'notifier/fake_invalidation_state_tracker.cc',
         'notifier/fake_invalidation_state_tracker.h',
         'notifier/fake_invalidator.cc',
         'notifier/fake_invalidator.h',
         'notifier/invalidator_test_template.cc',
         'notifier/invalidator_test_template.h',
+        'notifier/mock_ack_handler.cc',
+        'notifier/mock_ack_handler.h',
       ],
     },
 
     # Test support files for the 'sync_internal_api' target.
     {
       'target_name': 'test_support_sync_internal_api',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
       'include_dirs': [
         '..',
@@ skipping 503 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' ],
         },
       ],
     }],
   ],
 }