Implement AudioOutputProxy.

media/audio/audio_manager.h

 // Copyright (c) 2010 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_AUDIO_MANAGER_H_
 #define MEDIA_AUDIO_AUDIO_MANAGER_H_
 
 #include "base/basictypes.h"
 #include "media/audio/audio_parameters.h"
 
@@ skipping 53 matching lines @@
   virtual AudioInputStream* MakeAudioInputStream(AudioParameters params) = 0;
 
   // Muting continues playback but effectively the volume is set to zero.
   // Un-muting returns the volume to the previous level.
   virtual void MuteAll() = 0;
   virtual void UnMuteAll() = 0;
 
   // Returns message loop used for audio IO.
   virtual MessageLoop* GetMessageLoop() = 0;
 
+  virtual AudioOutputStream* MakeAudioOutputStreamProxy(

[scherkus (not reviewing), 2010/11/22 06:43:15]

comment?  for example how does this differ from MakeAudioOutputStream()?  In
fact this method definition should be moved underneath MakeAudioOutput() to make
the distinction more clear

const AudioParameters& params? (you seem to use const refs in other parts of
this patch and I think you said you were going to switch over in a future CL)

[Sergey Ulanov, 2010/11/23 19:51:46]

Done.
Changed it to const ref for this method. Will update MakeAudioOutputStream() in
a separate CL.

+      AudioParameters params) = 0;
+
   // Get AudioManager singleton.
   // TODO(cpu): Define threading requirements for interacting with AudioManager.
   static AudioManager* GetAudioManager();
 
  protected:
   virtual ~AudioManager() {}
 
   // Called from GetAudioManager() to initialiaze the instance.
   virtual void Init() = 0;
 
  private:
   static void Destroy(void*);
 
   // Called by GetAudioManager() to create platform-specific audio manager.
   static AudioManager* CreateAudioManager();
 };
 
 #endif  // MEDIA_AUDIO_AUDIO_MANAGER_H_