Add implementation for Ad Networks Database

chrome/chrome_tests_unit.gypi

 # Copyright 2012 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': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
       'type': 'static_library',
@@ skipping 813 matching lines @@
         'browser/drive/drive_uploader_unittest.cc',
         'browser/drive/event_logger_unittest.cc',
         'browser/drive/fake_drive_service_unittest.cc',
         'browser/enumerate_modules_model_unittest_win.cc',
         'browser/extensions/active_tab_unittest.cc',
         'browser/extensions/activity_log/activity_database_unittest.cc',
         'browser/extensions/activity_log/activity_log_enabled_unittest.cc',
         'browser/extensions/activity_log/activity_log_unittest.cc',
         'browser/extensions/activity_log/activity_log_policy_unittest.cc',
         'browser/extensions/activity_log/ad_injection_unittest.cc',
+        'browser/extensions/activity_log/ad_network_database_unittest.cc',
         'browser/extensions/activity_log/counting_policy_unittest.cc',
         'browser/extensions/activity_log/database_string_table_unittest.cc',
         'browser/extensions/activity_log/fullstream_ui_policy_unittest.cc',
         'browser/extensions/activity_log/uma_policy_unittest.cc',
         'browser/extensions/api/activity_log_private/activity_log_private_api_unittest.cc',
         'browser/extensions/api/alarms/alarms_api_unittest.cc',
         'browser/extensions/api/api_resource_manager_unittest.cc',
         'browser/extensions/api/bluetooth/bluetooth_api_unittest.cc',
         'browser/extensions/api/bluetooth/bluetooth_event_router_unittest.cc',
         'browser/extensions/api/bookmarks/bookmark_api_helpers_unittest.cc',
@@ skipping 1994 matching lines @@
             'browser/ui/app_list/test/fake_profile_store.h',
             'browser/ui/app_list/test/fast_show_pickler_unittest.cc',
             'browser/ui/views/app_list/linux/app_list_linux_unittest.cc',
             'browser/ui/views/app_list/win/app_list_win_unittest.cc',
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }