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

media/base/audio_renderer_mixer.h

 // 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.
 
 #ifndef MEDIA_BASE_AUDIO_RENDERER_MIXER_H_
 #define MEDIA_BASE_AUDIO_RENDERER_MIXER_H_
 
 #include <map>
+#include <string>
 
 #include "base/synchronization/lock.h"
 #include "base/time/time.h"
 #include "media/base/audio_converter.h"
 #include "media/base/audio_renderer_sink.h"
 
 namespace media {
 
 // Mixes a set of AudioConverter::InputCallbacks into a single output stream
 // which is funneled into a single shared AudioRendererSink; saving a bundle
@@ skipping 13 matching lines @@
   // Since errors may occur even when no inputs are playing, an error callback
   // must be registered separately from adding a mixer input.  The same callback
   // must be given to both the functions.
   void AddErrorCallback(const base::Closure& error_cb);
   void RemoveErrorCallback(const base::Closure& error_cb);
 
   void set_pause_delay_for_testing(base::TimeDelta delay) {
     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;
   void OnRenderError() override;
 
   // Output sink for this mixer.
   scoped_refptr<AudioRendererSink> audio_sink_;
 
   // ---------------[ All variables below protected by |lock_| ]---------------
   base::Lock lock_;
@@ skipping 10 matching lines @@
   base::TimeDelta pause_delay_;
   base::TimeTicks last_play_time_;
   bool playing_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioRendererMixer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_AUDIO_RENDERER_MIXER_H_