Add support for switching the audio output device for HTMLMediaElements.

media/mojo/services/mojo_renderer_impl.h

Index: media/mojo/services/mojo_renderer_impl.h
diff --git a/media/mojo/services/mojo_renderer_impl.h b/media/mojo/services/mojo_renderer_impl.h
index 7b955a2cc1badd3ad67ac8824998c372c12c0d2e..e85ff7a4646c32a914b27ea1bc085d1bf06e58d9 100644
--- a/media/mojo/services/mojo_renderer_impl.h
+++ b/media/mojo/services/mojo_renderer_impl.h
@@ -5,10 +5,13 @@
 #ifndef MEDIA_MOJO_SERVICES_MOJO_RENDERER_IMPL_H_
 #define MEDIA_MOJO_SERVICES_MOJO_RENDERER_IMPL_H_
 
+#include <string>
+
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "media/base/renderer.h"
 #include "media/mojo/interfaces/media_renderer.mojom.h"
+#include "url/gurl.h"
 
 namespace base {
 class SingleThreadTaskRunner;
@@ -46,6 +49,8 @@ class MojoRendererImpl : public Renderer, public mojo::MediaRendererClient {
   void StartPlayingFrom(base::TimeDelta time) override;
   void SetPlaybackRate(double playback_rate) override;
   void SetVolume(float volume) override;
+  void SwitchAudioOutputDevice(const std::string& device_id,
+                               const GURL& security_origin) override;
   base::TimeDelta GetMediaTime() override;
   bool HasAudio() override;
   bool HasVideo() override;