clipPadding (padding) {
        if (!arguments.length) {
            return this._clipPadding;
        }
        this._clipPadding = padding;
        return this;
    }
Get or set the padding in pixels for the clip path. Once set padding will be applied evenly to
the top, left, right, and bottom when the clip path is generated. If set to zero, the clip area
will be exactly the chart body area minus the margins.
@param {Number} [padding=5]
@returns {Number|CoordinateGridMixin}