Add stats overlay to iOS AppRTCDemo.

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

Index: webrtc/examples/objc/AppRTCDemo/ios/ARDVideoCallView.h
diff --git a/webrtc/examples/objc/AppRTCDemo/ios/ARDVideoCallView.h b/webrtc/examples/objc/AppRTCDemo/ios/ARDVideoCallView.h
index 320892590ba429a215e7bc4a64b78961d7c8efbf..209bcd462c739aa5378fda3628262e050130b783 100644
--- a/webrtc/examples/objc/AppRTCDemo/ios/ARDVideoCallView.h
+++ b/webrtc/examples/objc/AppRTCDemo/ios/ARDVideoCallView.h
@@ -12,6 +12,8 @@
 
 #import "RTCEAGLVideoView.h"
 
+#import "ARDStatsView.h"
+
 @class ARDVideoCallView;
 @protocol ARDVideoCallViewDelegate <NSObject>
 
@@ -21,6 +23,9 @@
 // Called when the hangup button is pressed.
 - (void)videoCallViewDidHangup:(ARDVideoCallView *)view;
 
+// Called when stats are enabled by triple tapping.
+- (void)videoCallViewDidEnableStats:(ARDVideoCallView *)view;
+
 @end
 
 // Video call view that shows local and remote video, provides a label to
@@ -30,6 +35,7 @@
 @property(nonatomic, readonly) UILabel *statusLabel;
 @property(nonatomic, readonly) RTCEAGLVideoView *localVideoView;
 @property(nonatomic, readonly) RTCEAGLVideoView *remoteVideoView;
+@property(nonatomic, readonly) ARDStatsView *statsView;
 @property(nonatomic, weak) id<ARDVideoCallViewDelegate> delegate;
 
 @end