player timer update throttled at 60 times per sec instead 1 per sec

Hello,

Here's a proposal to update the timer at 60Hz rate, so that drawing a progress bar could be done at 60fps. 

Unfortunately, currently HTML5 Media Element doesn't update at 60 fps, but it might happen eventually; still it updates more often than once per sec you have throttled here, so it gets a bit smoother progress bar rendering.

If you agree with the idea, pls merge this pull request. Thx