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

media/base/audio_renderer_sink.h

Index: media/base/audio_renderer_sink.h
diff --git a/media/base/audio_renderer_sink.h b/media/base/audio_renderer_sink.h
index fa1ee84c250a10e16eb0db310b38a31cd555c65c..77569209917639b07ec71514f3ba00d0e85df881 100644
--- a/media/base/audio_renderer_sink.h
+++ b/media/base/audio_renderer_sink.h
@@ -5,13 +5,21 @@
 #ifndef MEDIA_BASE_AUDIO_RENDERER_SINK_H_
 #define MEDIA_BASE_AUDIO_RENDERER_SINK_H_
 
+#include <string>
 #include <vector>
+
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "media/audio/audio_parameters.h"
 #include "media/base/audio_bus.h"
+#include "media/base/audio_output_device_callback_util.h"
 #include "media/base/media_export.h"
+#include "url/gurl.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+}
 
 namespace media {
 
@@ -56,6 +64,15 @@ class AudioRendererSink
   // Returns |true| on success.
   virtual bool SetVolume(double volume) = 0;
 
+  // Attempts to switch the audio output device.
+  // Once the attempt is finished, the |callback_runner| is invoked with the
+  // result of the operation passed as a parameter. The result is a value from
+  // the  media::SwitchOutputDeviceResult enum.
+  virtual void SwitchOutputDevice(
+      const std::string& device_id,
+      const GURL& security_origin,
+      scoped_ptr<SwitchOutputDeviceCallbackRunner> callback_runner) = 0;
+
  protected:
   friend class base::RefCountedThreadSafe<AudioRendererSink>;
   virtual ~AudioRendererSink() {}