Fix stats hud in AppRTC Demo for iOS.

webrtc/examples/objc/AppRTCDemo/ARDStatsBuilder.m

Index: webrtc/examples/objc/AppRTCDemo/ARDStatsBuilder.m
diff --git a/webrtc/examples/objc/AppRTCDemo/ARDStatsBuilder.m b/webrtc/examples/objc/AppRTCDemo/ARDStatsBuilder.m
index 1f4ada6237de68c33b7102d2d37079369c273d28..d53165bf0cdd4144a80a65db043ec9872b136c1c 100644
--- a/webrtc/examples/objc/AppRTCDemo/ARDStatsBuilder.m
+++ b/webrtc/examples/objc/AppRTCDemo/ARDStatsBuilder.m
@@ -196,11 +196,10 @@
 
 - (void)parseSendSsrcStatsReport:(RTCStatsReport *)statsReport {
   NSDictionary *values = statsReport.values;
-  NSString *trackId = values[@"googTrackId"];
-  if (trackId.length && [trackId hasPrefix:@"ARDAMSv0"]) {
+  if ([values objectForKey:@"googFrameRateSent"]) {
     // Video track.
     [self parseVideoSendStatsReport:statsReport];
-  } else {
+  } else if ([values objectForKey:@"audioInputLevel"]) {
     // Audio track.
     [self parseAudioSendStatsReport:statsReport];
   }
@@ -248,9 +247,11 @@
 
 - (void)parseRecvSsrcStatsReport:(RTCStatsReport *)statsReport {
   NSDictionary *values = statsReport.values;
-  if (values[@"googFrameWidthReceived"]) {
+  if ([values objectForKey:@"googFrameWidthReceived"]) {
+    // Video track.
     [self parseVideoRecvStatsReport:statsReport];
-  } else {
+  } else if ([values objectForKey:@"audioOutputLevel"]) {
+    // Audio track.
     [self parseAudioRecvStatsReport:statsReport];
   }
 }