Scale = function (rect, x, y)
{
    if (y === undefined) { y = x; }

    rect.width *= x;
    rect.height *= y;

    return rect;
}
Scales the width and height of this Rectangle by the given amounts.

@function Phaser.Geom.Rectangle.Scale
@since 3.0.0

@generic {Phaser.Geom.Rectangle} O - [rect,$return]

@param {Phaser.Geom.Rectangle} rect - The `Rectangle` object that will be scaled by the specified amount(s).
@param {number} x - The factor by which to scale the rectangle horizontally.
@param {number} y - The amount by which to scale the rectangle vertically. If this is not specified, the rectangle will be scaled by the factor `x` in both directions.

@return {Phaser.Geom.Rectangle} The rectangle object with updated `width` and `height` properties as calculated from the scaling factor(s).