ChromeOS: Implement MediaTransferProtocolManager observer.

chrome/chrome_tests.gypi

 # Copyright (c) 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.
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 1648 matching lines @@
         'browser/sync/sync_prefs_unittest.cc',
         'browser/sync/sync_ui_util_mac_unittest.mm',
         'browser/sync/sync_ui_util_unittest.cc',
         'browser/sync/test/test_http_bridge_factory.cc',
         'browser/sync/test/test_http_bridge_factory.h',
         'browser/sync/test_profile_sync_service.cc',
         'browser/sync/test_profile_sync_service.h',
         'browser/system_monitor/media_device_notifications_chromeos_unittest.cc',
         'browser/system_monitor/media_device_notifications_utils_unittest.cc',
         'browser/system_monitor/media_storage_util_unittest.cc',
+        'browser/system_monitor/media_transfer_protocol_device_observer_chromeos_unittest.cc',
         'browser/system_monitor/removable_device_notifications_linux_unittest.cc',
         'browser/system_monitor/removable_device_notifications_window_win_unittest.cc',
         'browser/tab_contents/render_view_context_menu_unittest.cc',
         'browser/tab_contents/thumbnail_generator_unittest.cc',
         'browser/tab_contents/web_contents_user_data_unittest.cc',
         'browser/task_manager/task_manager_unittest.cc',
         'browser/task_profiler/task_profiler_data_serializer_unittest.cc',
         'browser/themes/browser_theme_pack_unittest.cc',
         'browser/themes/theme_service_unittest.cc',
         'browser/ui/ash/event_rewriter_unittest.cc',
@@ skipping 3083 matching lines @@
                 '--result', '<@(_outputs)',
                 '--isolate', 'browser_tests.isolate',
               ],
             },
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }