AppRTCDemo(iOS): now works in the iOS Simulator!

...which has no camera device emulation or pass-through, so no local video
view.

R=noahric@google.com

Review URL: https://webrtc-codereview.appspot.com/10919004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5815 4adac7df-926f-26a2-2b94-8c16560cd09d

talk/app/webrtc/objc/RTCVideoRenderer.mm

@@ -142,6 +142,8 @@ class CallbackConverter : public webrtc::VideoRendererInterface {
 }
 
 - (void)stop {
+  [_activityIndicator stopAnimating];
+  [_activityIndicator removeFromSuperview];
   _iosRenderer->StopRender();
 }
 

talk/examples/ios/AppRTCDemo/APPRTCAppDelegate.m

@@ -247,6 +247,11 @@
   RTCMediaStream* lms =
       [self.peerConnectionFactory mediaStreamWithLabel:@"ARDAMS"];
 
+  // The iOS simulator doesn't provide any sort of camera capture
+  // support or emulation (http://goo.gl/rHAnC1) so don't bother
+  // trying to open a local stream.
+  RTCVideoTrack* localVideoTrack;
+#if !TARGET_IPHONE_SIMULATOR
   NSString* cameraID = nil;
   for (AVCaptureDevice* captureDevice in
        [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo]) {
@@ -262,12 +267,13 @@
   self.videoSource = [self.peerConnectionFactory
       videoSourceWithCapturer:capturer
                   constraints:self.client.videoConstraints];
-  RTCVideoTrack* localVideoTrack =
+  localVideoTrack =
       [self.peerConnectionFactory videoTrackWithID:@"ARDAMSv0"
                                             source:self.videoSource];
   if (localVideoTrack) {
     [lms addVideoTrack:localVideoTrack];
   }
+#endif
 
   [self.viewController.localVideoView
       renderVideoTrackInterface:localVideoTrack];