Adding AecDump functionality to AppRTCDemo for iOS

BUG=webrtc:6229

Review-Url: https://codereview.webrtc.org/2253013006
Cr-Commit-Position: refs/heads/master@{#13927}
diff --git a/webrtc/examples/objc/AppRTCDemo/ios/ARDVideoCallViewController.h b/webrtc/examples/objc/AppRTCDemo/ios/ARDVideoCallViewController.h
index f3a9554..ffffd12 100644
--- a/webrtc/examples/objc/AppRTCDemo/ios/ARDVideoCallViewController.h
+++ b/webrtc/examples/objc/AppRTCDemo/ios/ARDVideoCallViewController.h
@@ -24,6 +24,7 @@
 - (instancetype)initForRoom:(NSString *)room
                  isLoopback:(BOOL)isLoopback
                 isAudioOnly:(BOOL)isAudioOnly
+          shouldMakeAecDump:(BOOL)shouldMakeAecDump
                    delegate:(id<ARDVideoCallViewControllerDelegate>)delegate;
 
 @end