bug 975782 stop delaying the load event when media fetch has stalled r=cpearce,f=kinetik

dom/html/HTMLMediaElement.cpp

@@ -693,7 +693,8 @@ void HTMLMediaElement::AbortExistingLoads()
 
 void HTMLMediaElement::NoSupportedMediaSourceError()
 {
-  NS_ASSERTION(mDelayingLoadEvent, "Load event not delayed during source selection?");
+  NS_ASSERTION(mNetworkState == NETWORK_LOADING,
+               "Not loading during source selection?");
 
   mError = new MediaError(this, nsIDOMMediaError::MEDIA_ERR_SRC_NOT_SUPPORTED);
   ChangeNetworkState(nsIDOMHTMLMediaElement::NETWORK_NO_SOURCE);
@@ -3128,11 +3129,16 @@ void HTMLMediaElement::CheckProgress(bool aHaveNewProgress)
                    "timer dispatched when there was no timer");
       // Were stalled.  Restart timer.
       StartProgressTimer();
+      if (!mLoadedDataFired) {
+        ChangeDelayLoadStatus(true);
+      }
     }
   }
 
   if (now - mDataTime >= TimeDuration::FromMilliseconds(STALL_MS)) {
     DispatchAsyncEvent(NS_LITERAL_STRING("stalled"));
+    ChangeDelayLoadStatus(false);
+
     NS_ASSERTION(mProgressTimer, "detected stalled without timer");
     // Stop timer events, which prevents repeated stalled events until there
     // is more progress.