title: Up to date polyfill for requestAnimationFrame
body: <p><a href="http://updates.html5rocks.com/2012/05/requestAnimationFrame-API-now-with-sub-millisecond-precision">http://updates.html5rocks.com/2012/05/requestAnimationFrame-API-now-with-sub-millisecond-precision</a> tells me that recently (Chrome 20) requestAnimationFrame has gained a new sub-millisecond precision timer, and that I have to update my code to support it.</p>
  
  <p>Looking around at the various polyfills around, they all seem to pre-date this update. Are they somehow functional (I don't think so), or is there simply not an up-to-date one available? Should I just do the timing myself (seems a bit wasteful).</p>