Caching AudioOutputDevice instances in mixer manager

media/base/fake_audio_renderer_sink.h

 // Copyright 2013 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_FAKE_AUDIO_RENDERER_SINK_H_
 #define MEDIA_BASE_FAKE_AUDIO_RENDERER_SINK_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 11 matching lines @@
     kUninitialized,
     kInitialized,
     kStarted,
     kPaused,
     kPlaying,
     kStopped
   };
 
   FakeAudioRendererSink();
 
+  explicit FakeAudioRendererSink(const AudioParameters& hardware_params);
+
   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;
   OutputDeviceInfo GetOutputDeviceInfo() override;
 
   // Attempts to call Render() on the callback provided to
@@ skipping 19 matching lines @@
   State state_;
   RenderCallback* callback_;
   OutputDeviceInfo output_device_info_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeAudioRendererSink);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_FAKE_AUDIO_RENDERER_SINK_H_