Adding AecDump functionality to AppRTCDemo for iOS

webrtc/examples/objc/AppRTCDemo/ARDAppClient+Internal.h

Index: webrtc/examples/objc/AppRTCDemo/ARDAppClient+Internal.h
diff --git a/webrtc/examples/objc/AppRTCDemo/ARDAppClient+Internal.h b/webrtc/examples/objc/AppRTCDemo/ARDAppClient+Internal.h
index f2da4136e79ae30ffede03a82232bf8c2e4a7a81..cdcac966ae38e3e6615afea318ebf9dfe5aa1e07 100644
--- a/webrtc/examples/objc/AppRTCDemo/ARDAppClient+Internal.h
+++ b/webrtc/examples/objc/AppRTCDemo/ARDAppClient+Internal.h
@@ -43,6 +43,8 @@
 @property(nonatomic, strong) NSURL *webSocketRestURL;
 @property(nonatomic, readonly) BOOL isLoopback;
 @property(nonatomic, readonly) BOOL isAudioOnly;
+@property(nonatomic, readonly) BOOL shouldMakeAecDump;
+@property(nonatomic, assign) BOOL isAecDumpActive;
 
 @property(nonatomic, strong)
     RTCMediaConstraints *defaultPeerConnectionConstraints;