code: public TouchActions scroll(int xOffset, int yOffset) {
      if (touchScreen != null) {
        action.addAction(new ScrollAction(touchScreen, xOffset, yOffset));
      }
      return this;
    }
docs: Allows the view to be scrolled by an x and y offset.
  
  @param xOffset The horizontal offset relative to the viewport
  @param yOffset The vertical offset relative to the viewport
  @return self