PerformanceOverlayLayer({@required Rect overlayRect, @required int optionsMask, @required int rasterizerThreshold, @required bool checkerboardRasterCacheImages })

Creates a layer that displays a performance overlay.

Source 

PerformanceOverlayLayer({
  @required this.overlayRect,
  @required this.optionsMask,
  @required this.rasterizerThreshold,
  @required this.checkerboardRasterCacheImages,
});