| Index: webrtc/modules/audio_device/ios/objc/RTCAudioSession.h | 
| diff --git a/webrtc/modules/audio_device/ios/objc/RTCAudioSession.h b/webrtc/modules/audio_device/ios/objc/RTCAudioSession.h | 
| index 155929cfc7d6fd1735cdb364b3cd8fe9710c36bb..c0ea2163ae2a908d16d2ba49f56fc84606a9bb69 100644 | 
| --- a/webrtc/modules/audio_device/ios/objc/RTCAudioSession.h | 
| +++ b/webrtc/modules/audio_device/ios/objc/RTCAudioSession.h | 
| @@ -74,6 +74,10 @@ RTC_EXPORT | 
| */ | 
| - (void)audioSessionDidStopPlayOrRecord:(RTCAudioSession *)session; | 
|  | 
| +/** Called when the AVAudioSession output volume value changes. */ | 
| +- (void)audioSession:(RTCAudioSession *)audioSession | 
| +    didChangeOutputVolume:(float)outputVolume; | 
| + | 
| @end | 
|  | 
| /** This is a protocol used to inform RTCAudioSession when the audio session | 
|  |