Adding AecDump functionality to AppRTCDemo for iOS

webrtc/examples/objc/AppRTCDemo/ios/ARDVideoCallViewController.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 ARDVideoCallViewController;
 @protocol ARDVideoCallViewControllerDelegate <NSObject>
 
 - (void)viewControllerDidFinish:(ARDVideoCallViewController *)viewController;
 
 @end
 
 @interface ARDVideoCallViewController : UIViewController
 
 @property(nonatomic, weak) id<ARDVideoCallViewControllerDelegate> delegate;
 
 - (instancetype)initForRoom:(NSString *)room
                  isLoopback:(BOOL)isLoopback
                 isAudioOnly:(BOOL)isAudioOnly
+          shouldMakeAecDump:(BOOL)shouldMakeAecDump
                    delegate:(id<ARDVideoCallViewControllerDelegate>)delegate;
 
 @end