Add support for switching the audio output device for HTMLMediaElements.

media/audio/audio_output_stream_sink.cc

Index: media/audio/audio_output_stream_sink.cc
diff --git a/media/audio/audio_output_stream_sink.cc b/media/audio/audio_output_stream_sink.cc
index e233e994a1503ffd02aaba539c5c50bad113bcac..293db3af205550ec839af58dcb80605b7b9f8b0f 100644
--- a/media/audio/audio_output_stream_sink.cc
+++ b/media/audio/audio_output_stream_sink.cc
@@ -57,7 +57,13 @@ bool AudioOutputStreamSink::SetVolume(double volume) {
   audio_task_runner_->PostTask(
       FROM_HERE, base::Bind(&AudioOutputStreamSink::DoSetVolume, this, volume));
   return true;
-};
+}
+
+void AudioOutputStreamSink::SwitchOutputDevice(
+    const std::string& device_id,
+    const GURL& security_origin,
+    const base::Callback<void(int)>& callback) { }

[miu, 2015/06/03 21:01:01]

All the other default method implementations run their callback.  You should
always run the callback passed in here with some kind of failure code.

+
 
 int AudioOutputStreamSink::OnMoreData(AudioBus* dest,
                                       uint32 total_bytes_delay) {