Commits on Jul 25, 2019

1. [scheduler] Yield many times per frame, no rAF …

   Adds experimental flag to yield many times per frame using a message
   event loop, instead of the current approach of guessing the next vsync
   and yielding at the end of the frame.
   
   This new approach forgoes a `requestAnimationFrame` entirely. It posts a
   message event and performs a small amount of work (5ms) before yielding
   to the browser, regardless of where it might be in the vsync cycle. At
   the end of the event, if there's work left over, it posts another
   message event.
   
   This should keep the main thread responsive even for really high frame
   rates. It also shouldn't matter if the hardware frame rate changes after
   page load (our current heuristic only detects if the frame rate
   increases, not decreases).
   
   The main risk is that yielding more often will exacerbate main thread
   contention with other browser tasks.
   
   Let's try it and see.

   

   acdlite committed Jul 25, 2019
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