Add support for switching the audio output device for HTMLMediaElements.

media/renderers/renderer_impl.cc

Index: media/renderers/renderer_impl.cc
diff --git a/media/renderers/renderer_impl.cc b/media/renderers/renderer_impl.cc
index c06553a0d7dc9f955352b26b57cd066208df6fa7..474417a28cacede34d3f3be37f81d425f7a73fa3 100644
--- a/media/renderers/renderer_impl.cc
+++ b/media/renderers/renderer_impl.cc
@@ -195,6 +195,18 @@ void RendererImpl::SetVolume(float volume) {
     audio_renderer_->SetVolume(volume);
 }
 
+void RendererImpl::SwitchAudioOutputDevice(
+    const std::string& device_id,
+    const GURL& security_origin,
+    const base::Callback<void(int)>& callback) {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  DVLOG(1) << __FUNCTION__ << "(" << device_id << ", "
+           << security_origin << ")";
+
+  if (audio_renderer_)
+    audio_renderer_->SwitchOutputDevice(device_id, security_origin, callback);
+}
+
 base::TimeDelta RendererImpl::GetMediaTime() {
   // No BelongsToCurrentThread() checking because this can be called from other
   // threads.