weird RAF

Game.prototype.stopLoop = function () {
    if (this.running) {

        console.log('cancel the game now');
        window.webkitCancelRequestAnimationFrame(this.animationID);
        this.running = false;

    }
};

Game.prototype.startLoop = function (arg) {

    console.log('starting');

    var parent = this;

    this.running = true;



    (function tick() {

        parent.update();

        if (parent.running) parent.animationID = webkitRequestAnimationFrame(tick);

    }());

};