Add support for switching the audio output device for HTMLMediaElements.

content/renderer/media/webrtc_audio_renderer.cc

Index: content/renderer/media/webrtc_audio_renderer.cc
diff --git a/content/renderer/media/webrtc_audio_renderer.cc b/content/renderer/media/webrtc_audio_renderer.cc
index dcc153c3bd7c18c56ae693b4c1cae9c675acd52b..d0b066f7b7808740b1273bfe4c76dca54347f092 100644
--- a/content/renderer/media/webrtc_audio_renderer.cc
+++ b/content/renderer/media/webrtc_audio_renderer.cc
@@ -106,6 +106,14 @@ class SharedAudioRenderer : public MediaStreamAudioRenderer {
     on_play_state_changed_.Run(media_stream_, &playing_state_);
   }
 
+  void SwitchOutputDevice(const std::string& device_id,
+                          const GURL& security_origin,
+                          const base::Callback<void(int)>& callback) override {
+    DCHECK(thread_checker_.CalledOnValidThread());
+    DVLOG(1) << __PRETTY_FUNCTION__;
+    delegate_->SwitchOutputDevice(device_id, security_origin, callback);
+  }
+
   base::TimeDelta GetCurrentRenderTime() const override {
     DCHECK(thread_checker_.CalledOnValidThread());
     return delegate_->GetCurrentRenderTime();
@@ -406,6 +414,15 @@ void WebRtcAudioRenderer::SetVolume(float volume) {
   OnPlayStateChanged(media_stream_, &playing_state_);
 }
 
+void WebRtcAudioRenderer::SwitchOutputDevice(
+    const std::string& device_id,
+    const GURL& security_origin,
+    const base::Callback<void(int)>& callback) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  DVLOG(1) << __PRETTY_FUNCTION__;
+  sink_->SwitchOutputDevice(device_id, security_origin, callback);
+}
+
 base::TimeDelta WebRtcAudioRenderer::GetCurrentRenderTime() const {
   DCHECK(thread_checker_.CalledOnValidThread());
   base::AutoLock auto_lock(lock_);