anchor.diff:      endMeasureFrame();
       profile.addDataPoint('drawFrameDuration', _drawFrameStopwatch.elapsed, reported: true);
   
  -    if (profile.shouldContinue()) {
  +    if (shouldContinue()) {
         window.scheduleFrame();
       } else {
         didStop();
  
positive.code:   @override
    VoidCallback didStop;
  
    Profile profile;
    Completer<void> _runCompleter;
  
  
negative.code:   @override
    VoidCallback didStop;
  
    @override
    Profile profile;
    Completer<void> _runCompleter;
  
  