code: public TouchActions doubleTap(WebElement onElement) {
      if (touchScreen != null) {
        action.addAction(new DoubleTapAction(touchScreen, (Locatable) onElement));
      }
      return this;
    }
docs: Allows the execution of double tap on the screen, analogous to double click using a Mouse.
  
  @param onElement The {@link WebElement} to double tap
  @return self