Show a notification when a braille display is connected.

chrome/chrome_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.
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 1083 matching lines @@
         'browser/extensions/alert_apitest.cc',
         'browser/extensions/all_urls_apitest.cc',
         'browser/extensions/api/activity_log_private/activity_log_private_apitest.cc',
         'browser/extensions/api/app_window/app_window_apitest.cc',
         'browser/extensions/api/audio/audio_apitest.cc',
         'browser/extensions/api/automation/automation_apitest.cc',
         'browser/extensions/api/autotest_private/autotest_private_apitest.cc',
         'browser/extensions/api/bluetooth/bluetooth_apitest.cc',
         'browser/extensions/api/bookmark_manager_private/bookmark_manager_private_apitest.cc',
         'browser/extensions/api/braille_display_private/braille_display_private_apitest.cc',
+        'browser/extensions/api/braille_display_private/mock_braille_controller.cc',
+        'browser/extensions/api/braille_display_private/mock_braille_controller.h',
         'browser/extensions/api/bookmarks/bookmark_apitest.cc',
         'browser/extensions/api/browsing_data/browsing_data_test.cc',
         'browser/extensions/api/cast_channel/cast_channel_apitest.cc',
         'browser/extensions/api/cast_streaming/cast_streaming_apitest.cc',
         'browser/extensions/api/cloud_print_private/cloud_print_private_apitest.cc',
         'browser/extensions/api/command_line_private/command_line_private_apitest.cc',
         'browser/extensions/api/commands/command_service_browsertest.cc',
         'browser/extensions/api/content_settings/content_settings_apitest.cc',
         'browser/extensions/api/context_menus/context_menu_apitest.cc',
         'browser/extensions/api/cookies/cookies_apitest.cc',
@@ skipping 2119 matching lines @@
             'utility',
           ],
           'sources': [
             'tools/service_discovery_sniffer/service_discovery_sniffer.h',
             'tools/service_discovery_sniffer/service_discovery_sniffer.cc',
           ],
         }]
     }],
   ],  # 'conditions'
 }