Bug 1109644. Part 3: Make MediaEngineDefaultVideoSource use GetEndOfAppendedData instead of aLastEndTime. r=jesup

--HG--
extra : rebase_source : d2285dad46e5b089b49e5ddce12564d5518c45a3

dom/media/webrtc/MediaEngineDefault.cpp

@@ -256,7 +256,7 @@ MediaEngineDefaultVideoSource::NotifyPull(MediaStreamGraph* aGraph,
 
   // Note: we're not giving up mImage here
   nsRefPtr<layers::Image> image = mImage;
-  StreamTime delta = aDesiredTime - aLastEndTime;
+  StreamTime delta = aDesiredTime - aSource->GetEndOfAppendedData(aID);
 
   if (delta > 0) {
     // nullptr images are allowed