anchor.diff:  
     bool _onFrame(int time) {
       _updateClock();
  +    _stage.draw();
  +    if(_mouseLocation != null){
  +      RetainedDebug.borderHitTest(_stage, _mouseLocation);
  +    }
       _requestFrame();
     }
   
  
positive.code:   void _gameUpdated(args) {
      updateElement();
    }
  }
  
negative.code:   static final String _yKey = 'y';
  
    final Stage _stage;
    final CanvasElement _canvas;
    final GameElement _gameElement;
    final Element _leftCountDiv;
    final Element _gameStateDiv;
    final Element _clockDiv;
  
    dartlib.GlobalId _updatedEventId;
    dartlib.Coordinate _mouseLocation;
  
    factory GameRoot(CanvasElement canvasElement,
        Element leftCountDiv, Element gameStateDiv, Element clockDiv) {
  