Loopback mode for AppRTCDemo on iOS.

webrtc/examples/objc/AppRTCDemo/ios/ARDMainView.h

 /*
  *  Copyright 2015 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #import <UIKit/UIKit.h>
 
 @class ARDMainView;
 
 @protocol ARDMainViewDelegate <NSObject>
 
-- (void)mainView:(ARDMainView *)mainView didInputRoom:(NSString *)room;
+- (void)mainView:(ARDMainView *)mainView
+    didInputRoom:(NSString *)room
+      isLoopback:(BOOL)isLoopback
+     isAudioOnly:(BOOL)isAudioOnly;
 
 @end
 
 // The main view of AppRTCDemo. It contains an input field for entering a room
 // name on apprtc to connect to.
 @interface ARDMainView : UIView
 
 @property(nonatomic, weak) id<ARDMainViewDelegate> delegate;
 
 @end