Allow webkitSpeechRecognition work from an app's background page.

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' : {
     'chromedriver_unittest_sources': [
       'test/chromedriver/capabilities_unittest.cc',
       'test/chromedriver/chrome/chrome_finder_unittest.cc',
       'test/chromedriver/chrome/console_logger_unittest.cc',
       'test/chromedriver/chrome/device_manager_unittest.cc',
@@ skipping 922 matching lines @@
         'app/chrome_dll_resource.h',
         'app/chrome_version.rc.version',
         'browser/accessibility/accessibility_extension_apitest.cc',
         'browser/accessibility/browser_accessibility_state_browsertest.cc',
         'browser/app_controller_mac_browsertest.mm',
         'browser/apps/ad_view_browsertest.cc',
         'browser/apps/app_browsertest.cc',
         'browser/apps/app_browsertest_util.cc',
         'browser/apps/app_browsertest_util.h',
         'browser/apps/app_url_redirector_browsertest.cc',
+        'browser/apps/speech_recognition_browsertest.cc',
         'browser/apps/web_view_browsertest.cc',
         'browser/apps/window_controls_browsertest.cc',
         'browser/autocomplete/autocomplete_browsertest.cc',
         'browser/autofill/autofill_browsertest.cc',
         'browser/autofill/autofill_driver_impl_browsertest.cc',
         'browser/autofill/form_structure_browsertest.cc',
         'browser/autofill/risk/fingerprint_browsertest.cc',
         'browser/browser_encoding_browsertest.cc',
         'browser/browsing_data/browsing_data_database_helper_browsertest.cc',
         'browser/browsing_data/browsing_data_helper_browsertest.h',
@@ skipping 2201 matching lines @@
             'utility',
           ],
           'sources': [
             'tools/service_discovery_sniffer/service_discovery_sniffer.h',
             'tools/service_discovery_sniffer/service_discovery_sniffer.cc',
           ],
         }]
     }],
   ],  # 'conditions'
 }