Grid Line Options
constructor(display: Boolean = true, color: <Error class: unknown class>? = null, lineWidth: Int? = null, drawOnChartArea: Boolean? = null, drawTicks: Boolean? = null, offset: Boolean? = null, tickLength: Number? = null, tickWidth: Number? = null, tickColor: <Error class: unknown class>? = null, tickBorderDash: List<Number>? = null, tickBorderDashOffset: Number? = null, circular: Boolean? = null, z: Number? = null)