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

media/audio/null_audio_sink.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_AUDIO_NULL_AUDIO_SINK_H_
 #define MEDIA_AUDIO_NULL_AUDIO_SINK_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 14 matching lines @@
   NullAudioSink(const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
 
   // AudioRendererSink implementation.
   void Initialize(const AudioParameters& params,
                   RenderCallback* callback) override;
   void Start() override;
   void Stop() override;
   void Pause() override;
   void Play() override;
   bool SetVolume(double volume) override;
+  void SwitchOutputDevice(const std::string& device_id,
+                          const GURL& security_origin,
+                          const SwitchOutputDeviceCB& callback) override;
 
   // Enables audio frame hashing.  Must be called prior to Initialize().
   void StartAudioHashForTesting();
 
   // Returns the hash of all audio frames seen since construction.
   std::string GetAudioHashForTesting();
 
  protected:
   ~NullAudioSink() override;
 
@@ skipping 11 matching lines @@
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   scoped_ptr<FakeAudioWorker> fake_worker_;
   scoped_ptr<AudioBus> audio_bus_;
 
   DISALLOW_COPY_AND_ASSIGN(NullAudioSink);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_NULL_AUDIO_SINK_H_