GN: Add targets for AppRTCDemo on Mac+iOS

webrtc/examples/objc/AppRTCDemo/mac/APPRTCViewController.m

 /*
  *  Copyright 2014 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.
  */
 
@@ skipping 29 matching lines @@
 
 @end
 
 @interface APPRTCMainView () <NSTextFieldDelegate, RTCNSGLVideoViewDelegate>
 @end
 @implementation APPRTCMainView  {
   NSScrollView* _scrollView;
   NSTextField* _roomLabel;
   NSTextField* _roomField;
   NSTextView* _logView;
-  RTCNSGLVideoView* _localVideoView;
-  RTCNSGLVideoView* _remoteVideoView;
   CGSize _localVideoSize;
   CGSize _remoteVideoSize;
 }
 
+@synthesize delegate = _delegate;
+@synthesize localVideoView = _localVideoView;
+@synthesize remoteVideoView = _remoteVideoView;
+
 + (BOOL)requiresConstraintBasedLayout {
   return YES;
 }
 
 - (instancetype)initWithFrame:(NSRect)frame {
   if (self = [super initWithFrame:frame]) {
     [self setupViews];
   }
   return self;
 }
@@ skipping 237 matching lines @@
   _remoteVideoTrack = nil;
   [self.mainView.remoteVideoView renderFrame:nil];
 }
 
 - (void)disconnect {
   [self resetUI];
   [_client disconnect];
 }
 
 @end