Bug 1180145, part 3 - Block resource timing reporting for channels that are tainted. r=jwatt

MozReview-Commit-ID: FdlbJ2YYMaG

dom/performance/PerformanceMainThread.cpp

@@ -141,6 +141,17 @@ PerformanceMainThread::AddEntry(nsIHttpChannel* channel,
     originalURI->GetSpec(name);
     NS_ConvertUTF8toUTF16 entryName(name);
 
+    bool reportTiming = true;
+    timedChannel->GetReportResourceTiming(&reportTiming);
+
+    if (!reportTiming) {
+#ifdef DEBUG_jwatt
+      NS_WARNING(
+        nsPrintfCString("Not reporting CORS resource: %s", name.get()).get());
+#endif
+      return;
+    }
+
     // The nsITimedChannel argument will be used to gather all the timings.
     // The nsIHttpChannel argument will be used to check if any cross-origin
     // redirects occurred.