anchor.diff:  double timeBase;
   RenderTransform transformBox;
   
  +final TestRenderView tester = new TestRenderView();
  +
   void rotate(double timeStamp) {
     if (timeBase == null)
       timeBase = timeStamp;
  
positive.code: import 'package:vector_math/vector_math.dart';
  
  import '../lib/solid_color_box.dart';
  
  // Solid colour, RenderObject version
  void addFlexChildSolidColor(RenderFlex parent, sky.Color backgroundColor, { int flex: 0 }) {
  
negative.code:   transformBox = new RenderTransform(child: flexRoot, transform: new Matrix4.identity());
    RenderPadding root = new RenderPadding(padding: new EdgeDims.all(20.0), child: transformBox);
  
    UINodeAppView.appView.root = root;
    addPersistentFrameCallback(rotate);
  }
  