Add support for switching the audio output device for HTMLMediaElements.

content/renderer/media/webrtc_local_audio_renderer.cc

 // Copyright (c) 2012 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.
 
 #include "content/renderer/media/webrtc_local_audio_renderer.h"
 
 #include "base/logging.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/metrics/histogram.h"
 #include "base/synchronization/lock.h"
@@ skipping 189 matching lines @@
   }
 
   // Lazily start the |sink_| when the local renderer is unmuted during
   // playing.
   MaybeStartSink();
 
   if (sink_.get())
     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_);
   if (!sink_.get())
     return base::TimeDelta();
   return total_render_time();
 }
 
 bool WebRtcLocalAudioRenderer::IsLocalRenderer() const {
   return true;
@@ skipping 82 matching lines @@
   if (sink_started_) {
     sink_->Stop();
     sink_started_ = false;
   }
 
   sink_ = AudioDeviceFactory::NewOutputDevice(source_render_frame_id_);
   MaybeStartSink();
 }
 
 }  // namespace content