Commits on Aug 18, 2014

1. Debounces scroll events in web viewer. …

   As requested in mozilla#5178, this change debounces the scroll events.
   The reason for doing so is that browsers can event-storm especially on
   scroll, communicating hundreds of subpixel changes.
   
   The main reason for this resulting in poor performance is that on each
   scroll event `scrollTop` was queried, which forces layouting.
   
   This change will use `requestAnimationFrame` to make sure the browser can
   allocate enough time to other tasks. The delay is however quite small, thus
   the reduction in executions is less noticeable. Modern browsers however utilize
   `requestAnimationFrame` to smoothen out rendering.

   

   CodingFabian committed Aug 18, 2014
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