Add support for switching the audio output device for HTMLMediaElements.

content/renderer/media/webrtc_local_audio_renderer.cc

Index: content/renderer/media/webrtc_local_audio_renderer.cc
diff --git a/content/renderer/media/webrtc_local_audio_renderer.cc b/content/renderer/media/webrtc_local_audio_renderer.cc
index 727ed361d123719c421dd7d8f958dedb335940ac..f25a2b18b18ac3e7486af7c8e2ce8de264e0957e 100644
--- a/content/renderer/media/webrtc_local_audio_renderer.cc
+++ b/content/renderer/media/webrtc_local_audio_renderer.cc
@@ -207,6 +207,18 @@ void WebRtcLocalAudioRenderer::SetVolume(float volume) {
     sink_->SetVolume(volume);
 }
 
+void WebRtcLocalAudioRenderer::SwitchOutputDevice(
+    const std::string& device_id,
+    const GURL& security_origin,
+    const base::Callback<void(int)>& callback) {
+  DVLOG(1) << "WebRtcLocalAudioRenderer::SwitchOutputDevice("
+           << device_id << ")";
+  DCHECK(message_loop_->BelongsToCurrentThread());
+
+  if (sink_.get())
+    sink_->SwitchOutputDevice(device_id, security_origin, callback);
+}
+
 base::TimeDelta WebRtcLocalAudioRenderer::GetCurrentRenderTime() const {
   DCHECK(message_loop_->BelongsToCurrentThread());
   base::AutoLock auto_lock(thread_lock_);