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: ~AudioPrefObserver()23 virtual ~AudioPrefObserver() {} 24 }; 25 26 } // namespace chromeos 27 28 #endif // CHROMEOS_AUDIO_AUDIO_PREF_OBSERVER_H_ 29