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requestAnimationFrame Polyfill
var requestAnimationFrame = window.requestAnimationFrame || (function() {
var timeLast = 0;
return window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || function(callback) {
var timeCurrent = (new Date()).getTime(),
timeDelta;
/* Dynamically set the delay on a per-tick basis to more closely match 60fps. */
/* Technique by Erik Moller. MIT license: https://gist.github.com/paulirish/1579671. */
timeDelta = Math.max(0, 16 - (timeCurrent - timeLast));
timeLast = timeCurrent + timeDelta;
return setTimeout(function() { callback(timeCurrent + timeDelta); }, timeDelta);
};
})();
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