Adding AecDump functionality to AppRTCDemo for 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
         isLoopback:(BOOL)isLoopback
        isAudioOnly:(BOOL)isAudioOnly
+       shouldMakeAecDump:(BOOL)shouldMakeAecDump

[tkchin_webrtc, 2016/08/24 00:42:20]

nit: align :
in cases like these where aligning will cause args to be less than 4 from
leftmost margin, indent the longest arg name by 4 and align : to that instead
(just like how useManualAudio was aligned because it was too long)

[peah-webrtc, 2016/08/25 09:25:08]

Done.

     useManualAudio:(BOOL)useManualAudio;
 
 - (void)mainViewDidToggleAudioLoop:(ARDMainView *)mainView;
 
 @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;
 // Updates the audio loop button as needed.
 @property(nonatomic, assign) BOOL isAudioLoopPlaying;
 
 @end