Add Metal video view in AppRTCMobile and metal availability macro.

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

Index: webrtc/examples/objc/AppRTCMobile/ios/ARDVideoCallView.h
diff --git a/webrtc/examples/objc/AppRTCMobile/ios/ARDVideoCallView.h b/webrtc/examples/objc/AppRTCMobile/ios/ARDVideoCallView.h
index dec1bfcba069b1682df7bf9578c25dab71ebd2ed..a70c0754e65a32fd03efe9a708fe6ada8892db2b 100644
--- a/webrtc/examples/objc/AppRTCMobile/ios/ARDVideoCallView.h
+++ b/webrtc/examples/objc/AppRTCMobile/ios/ARDVideoCallView.h
@@ -11,7 +11,7 @@
 #import <UIKit/UIKit.h>
 
 #import "WebRTC/RTCCameraPreviewView.h"
-#import "WebRTC/RTCEAGLVideoView.h"
+#import <WebRTC/RTCVideoRenderer.h>

[kthelgason, 2017/02/28 10:03:10]

Stick to quotes or angle brackets, let's not mix them.

 
 #import "ARDStatsView.h"
 
@@ -38,7 +38,7 @@
 
 @property(nonatomic, readonly) UILabel *statusLabel;
 @property(nonatomic, readonly) RTCCameraPreviewView *localVideoView;
-@property(nonatomic, readonly) RTCEAGLVideoView *remoteVideoView;
+@property(nonatomic, readonly) __kindof UIView<RTCVideoRenderer> *remoteVideoView;
 @property(nonatomic, readonly) ARDStatsView *statsView;
 @property(nonatomic, weak) id<ARDVideoCallViewDelegate> delegate;