http://updates.html5rocks.com/2012/05/requestAnimationFrame-API-now-with-sub-millisecond-precision tells me that recently (Chrome 20) requestAnimationFrame has gained a new
Here is the blog entry from Paul Irish containing the original polyfil and his updates.
http://www.paulirish.com/2011/requestanimationframe-for-smart-animating/
That should suffice for most scenarios.