Add support for the audio-output-device switching IPC mechanism to the renderer lower layers (media…

media/base/audio_renderer_mixer.h

Index: media/base/audio_renderer_mixer.h
diff --git a/media/base/audio_renderer_mixer.h b/media/base/audio_renderer_mixer.h
index 35ed484976fdb83ee4975b955c10a5e3a296b131..dc9ab925b2435b32ad12c97b27762f8b80edb38c 100644
--- a/media/base/audio_renderer_mixer.h
+++ b/media/base/audio_renderer_mixer.h
@@ -6,6 +6,7 @@
 #define MEDIA_BASE_AUDIO_RENDERER_MIXER_H_
 
 #include <map>
+#include <string>
 
 #include "base/synchronization/lock.h"
 #include "base/time/time.h"
@@ -39,6 +40,10 @@ class MEDIA_EXPORT AudioRendererMixer
     pause_delay_ = delay;
   }
 
+  void SwitchOutputDevice(const std::string& device_id,
+                          const GURL& security_origin,
+                          const SwitchOutputDeviceCB& callback);
+
  private:
   // AudioRendererSink::RenderCallback implementation.
   int Render(AudioBus* audio_bus, int audio_delay_milliseconds) override;