1. @DomName('CanvasRenderingContext2D.arcTo')
  2. @DocsEditable()
void arcTo(num x1, num y1, num x2, num y2, num radius)

Source 

@DomName('CanvasRenderingContext2D.arcTo')
@DocsEditable()
void arcTo(num x1, num y1, num x2, num y2, num radius) =>
    _blink.BlinkCanvasRenderingContext2D.instance
        .arcTo_Callback_5_(this, x1, y1, x2, y2, radius);