Use new RTCCameraVideoCapturer in AppRTCMobile.

webrtc/examples/objc/AppRTCMobile/ios/ARDVideoCallViewController.m

Index: webrtc/examples/objc/AppRTCMobile/ios/ARDVideoCallViewController.m
diff --git a/webrtc/examples/objc/AppRTCMobile/ios/ARDVideoCallViewController.m b/webrtc/examples/objc/AppRTCMobile/ios/ARDVideoCallViewController.m
index cd42514a9f930690df6a97deb5e807427250b9ea..fac02ed9f71e3e44c8347ae989a948a609c8c3ac 100644
--- a/webrtc/examples/objc/AppRTCMobile/ios/ARDVideoCallViewController.m
+++ b/webrtc/examples/objc/AppRTCMobile/ios/ARDVideoCallViewController.m
@@ -22,7 +22,7 @@
 
 @interface ARDVideoCallViewController () <ARDAppClientDelegate,
     ARDVideoCallViewDelegate>
-@property(nonatomic, strong) RTCVideoTrack *localVideoTrack;
+@property(nonatomic, strong) RTCCameraVideoCapturer *localCapturer;
 @property(nonatomic, strong) RTCVideoTrack *remoteVideoTrack;
 @property(nonatomic, readonly) ARDVideoCallView *videoCallView;
 @end
@@ -30,12 +30,12 @@
 @implementation ARDVideoCallViewController {
   ARDAppClient *_client;
   RTCVideoTrack *_remoteVideoTrack;
-  RTCVideoTrack *_localVideoTrack;
+  RTCCameraVideoCapturer *_localCapturer;
   AVAudioSessionPortOverride _portOverride;
 }
 
+@synthesize localCapturer = _localCapturer;
 @synthesize videoCallView = _videoCallView;
-@synthesize localVideoTrack = _localVideoTrack;
 @synthesize remoteVideoTrack = _remoteVideoTrack;
 @synthesize delegate = _delegate;
 
@@ -97,8 +97,12 @@
 }
 
 - (void)appClient:(ARDAppClient *)client
+    didCreateLocalCapturer:(RTCCameraVideoCapturer *)localCapturer {
+  self.localCapturer = localCapturer;
+}
+
+- (void)appClient:(ARDAppClient *)client
     didReceiveLocalVideoTrack:(RTCVideoTrack *)localVideoTrack {
-  self.localVideoTrack = localVideoTrack;
 }
 
 - (void)appClient:(ARDAppClient *)client
@@ -130,7 +134,7 @@
 - (void)videoCallViewDidSwitchCamera:(ARDVideoCallView *)view {
   // TODO(tkchin): Rate limit this so you can't tap continously on it.
   // Probably through an animation.
-  [self switchCamera];
+  [_client switchCamera];
 }
 
 - (void)videoCallViewDidChangeRoute:(ARDVideoCallView *)view {
@@ -160,18 +164,12 @@
 
 #pragma mark - Private
 
-- (void)setLocalVideoTrack:(RTCVideoTrack *)localVideoTrack {
-  if (_localVideoTrack == localVideoTrack) {
+- (void)setLocalCapturer:(RTCCameraVideoCapturer *)localCapturer {
+  if (_localCapturer == localCapturer) {
     return;
   }
-  _localVideoTrack = nil;
-  _localVideoTrack = localVideoTrack;
-  RTCAVFoundationVideoSource *source = nil;
-  if ([localVideoTrack.source
-          isKindOfClass:[RTCAVFoundationVideoSource class]]) {
-    source = (RTCAVFoundationVideoSource*)localVideoTrack.source;
-  }
-  _videoCallView.localVideoView.captureSession = source.captureSession;
+  _localCapturer = localCapturer;
+  _videoCallView.localVideoView.captureSession = localCapturer.captureSession;
 }
 
 - (void)setRemoteVideoTrack:(RTCVideoTrack *)remoteVideoTrack {
@@ -187,19 +185,11 @@
 
 - (void)hangup {
   self.remoteVideoTrack = nil;
-  self.localVideoTrack = nil;
+  self.localCapturer = nil;
   [_client disconnect];
   [_delegate viewControllerDidFinish:self];
 }
 
-- (void)switchCamera {
-  RTCVideoSource* source = self.localVideoTrack.source;
-  if ([source isKindOfClass:[RTCAVFoundationVideoSource class]]) {
-    RTCAVFoundationVideoSource* avSource = (RTCAVFoundationVideoSource*)source;
-    avSource.useBackCamera = !avSource.useBackCamera;
-  }
-}
-
 - (NSString *)statusTextForState:(RTCIceConnectionState)state {
   switch (state) {
     case RTCIceConnectionStateNew: