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      1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROMEOS_AUDIO_AUDIO_PREF_OBSERVER_H_
      6 #define CHROMEOS_AUDIO_AUDIO_PREF_OBSERVER_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/memory/ref_counted.h"
     10 #include "chromeos/chromeos_export.h"
     11 
     12 class PrefRegistrySimple;
     13 
     14 namespace chromeos {
     15 
     16 // Interface for observing audio preference changes.
     17 class CHROMEOS_EXPORT AudioPrefObserver {
     18  public:
     19   // Called when audio policy prefs changed.
     20   virtual void OnAudioPolicyPrefChanged() = 0;
     21 
     22  protected:
     23   virtual ~AudioPrefObserver() {}
     24 };
     25 
     26 }  // namespace chromeos
     27 
     28 #endif  // CHROMEOS_AUDIO_AUDIO_PREF_OBSERVER_H_
     29