anchor.diff:      endMeasureFrame();
       profile.addDataPoint('drawFrameDuration', _drawFrameStopwatch.elapsed, reported: true);
   
  -    if (profile.shouldContinue()) {
  +    if (shouldContinue()) {
         window.scheduleFrame();
       } else {
         didStop();
  
positive.code:   @override
    Future<Profile> run() {
      final Completer<Profile> profileCompleter = Completer<Profile>();
      final Profile profile = Profile(name: name);
  
      window.onBeginFrame = (_) {
        try {
  
negative.code: abstract class SceneBuilderRecorder extends Recorder {
    SceneBuilderRecorder({@required String name}) : super._(name, true);
  
    @override
    Profile get profile => _profile;
    Profile _profile;
  
    /// Called from [Window.onBeginFrame].
    @mustCallSuper
    void onBeginFrame() {}
  