function scaleQuad(quad)
        {
            for (var i = 0; i < quad.length; i += 2) {
                quad[i] = quad[i] * this._screenZoom;
                quad[i + 1] = (quad[i + 1] + this._screenOffsetTop) * this._screenZoom;
            }
        }
@param {!DOMAgent.Quad} quad
@this {WebInspector.ScreencastView}