SetCenterY = function (gameObject, y)
{
    var offsetY = gameObject.height * gameObject.originY;

    gameObject.y = (y + offsetY) - (gameObject.height * 0.5);

    return gameObject;
}
Positions the Game Object so that the center top of its bounds aligns with the given coordinate.

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

@generic {Phaser.GameObjects.GameObject} G - [gameObject,$return]

@param {Phaser.GameObjects.GameObject} gameObject - The Game Object that will be re-positioned.
@param {number} y - The coordinate to position the Game Object bounds on.

@return {Phaser.GameObjects.GameObject} The Game Object that was positioned.