Add support for switching the audio output device for HTMLMediaElements.

media/base/renderer.h

Index: media/base/renderer.h
diff --git a/media/base/renderer.h b/media/base/renderer.h
index 75372fba3a1559e39b1aaaab046cc09c1fa7982e..c6038c20368a578b64ecbf715d906b46c3848a36 100644
--- a/media/base/renderer.h
+++ b/media/base/renderer.h
@@ -5,6 +5,8 @@
 #ifndef MEDIA_BASE_RENDERER_H_
 #define MEDIA_BASE_RENDERER_H_
 
+#include <string>
+
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
@@ -12,6 +14,7 @@
 #include "media/base/cdm_context.h"
 #include "media/base/media_export.h"
 #include "media/base/pipeline_status.h"
+#include "url/gurl.h"
 
 namespace media {
 
@@ -70,6 +73,12 @@ class MEDIA_EXPORT Renderer {
   // Sets the output volume. The default volume should be 1.
   virtual void SetVolume(float volume) = 0;
 
+  // Switches the audio output device
+  virtual void SwitchAudioOutputDevice(
+      const std::string& device_id,
+      const GURL& security_origin,
+      const base::Callback<void(int)>& callback) = 0;
+
   // Returns the current media time.
   virtual base::TimeDelta GetMediaTime() = 0;