Chromium Code Reviews| Index: ash/system/audio/audio_observer.h | 
| diff --git a/ash/system/audio/audio_observer.h b/ash/system/audio/audio_observer.h | 
| index ebf5adb8d3c80378b891e1e4393385a250cc8817..d0ff405c42076c0a2b7bbb8ab37a21c2a2aecbd3 100644 | 
| --- a/ash/system/audio/audio_observer.h | 
| +++ b/ash/system/audio/audio_observer.h | 
| @@ -14,6 +14,7 @@ class ASH_EXPORT AudioObserver { | 
| virtual ~AudioObserver() {} | 
| virtual void OnVolumeChanged(float percent) = 0; | 
| + virtual void OnMuteToggled() = 0; | 
| }; | 
| } // namespace ash |