MediaCaptureFromElement: add support for audio captureStream().

content/content_tests.gypi

 # Copyright (c) 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': {
     'layouttest_support_content_sources': [
       'public/test/layouttest_support.h',
       'public/test/nested_message_pump_android.cc',
       'public/test/nested_message_pump_android.h',
@@ skipping 704 matching lines @@
       'renderer/gpu/frame_swap_message_queue_unittest.cc',
       'renderer/gpu/queue_message_swap_promise_unittest.cc',
       'renderer/gpu/render_widget_compositor_unittest.cc',
       'renderer/ico_image_decoder_unittest.cc',
       'renderer/input/input_event_filter_unittest.cc',
       'renderer/input/main_thread_event_queue_unittest.cc',
       'renderer/manifest/manifest_parser_unittest.cc',
       'renderer/media/android/media_info_loader_unittest.cc',
       'renderer/media/audio_message_filter_unittest.cc',
       'renderer/media/audio_renderer_mixer_manager_unittest.cc',
+      'renderer/media/html_audio_element_capturer_source_unittest.cc',
       'renderer/media/media_stream_audio_unittest.cc',
       'renderer/media/midi_message_filter_unittest.cc',
       'renderer/media/mock_audio_device_factory.cc',
       'renderer/media/mock_audio_device_factory.h',
       'renderer/media/render_media_client_unittest.cc',
       'renderer/media/render_media_log_unittest.cc',
       'renderer/media/video_capture_impl_manager_unittest.cc',
       'renderer/media/video_capture_impl_unittest.cc',
       'renderer/media/video_capture_message_filter_unittest.cc',
       'renderer/media/webmediaplayer_ms_unittest.cc',
@@ skipping 1181 matching lines @@
                   'content_unittests_apk.isolate',
                 ],
               },
             ],
           },
         ],
       ],
     }],
   ],
 }