GetOffsetY = function (gameObject)
{
    return gameObject.height * gameObject.originY;
}
Returns the amount the Game Object is visually offset from its y coordinate.
This is the same as `width * origin.y`.
This value will only be > 0 if `origin.y` is not equal to zero.

@function Phaser.Display.Bounds.GetOffsetY
@since 3.0.0

@param {Phaser.GameObjects.GameObject} gameObject - The Game Object to get the bounds value from.

@return {number} The vertical offset of the Game Object.