Link things together and enable the device selection for linux and mac.

media/audio/audio_manager_base.h

 // Copyright (c) 2011 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_BASE_H_
 #define MEDIA_AUDIO_AUDIO_MANAGER_BASE_H_
 
 #include <map>
 
 #include "base/compiler_specific.h"
 #include "base/threading/thread.h"
 #include "media/audio/audio_manager.h"
 
 class AudioOutputDispatcher;
 
 // AudioManagerBase provides AudioManager functions common for all platforms.
 class MEDIA_EXPORT AudioManagerBase : public AudioManager {
  public:
   // Name of the generic "default" device.
   static const char kDefaultDeviceName[];
+  // Unique Id of the generic "default" device.
+  static const char kDefaultDeviceId[];
 
   AudioManagerBase();
 
   virtual void Init() OVERRIDE;
   virtual void Cleanup() OVERRIDE;
 
   virtual MessageLoop* GetMessageLoop() OVERRIDE;
 
   virtual string16 GetAudioInputDeviceModel() OVERRIDE;
 
@@ skipping 34 matching lines @@
 
   // Lock used to synchronize the access to num_active_input_streams_.
   // Do not use for anything else and try to avoid using other locks
   // in this code whenever possible.
   base::Lock active_input_streams_lock_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioManagerBase);
 };
 
 #endif  // MEDIA_AUDIO_AUDIO_MANAGER_BASE_H_