Commits on May 5, 2020

1. Use a restyle for animation ticks …

   This change corrects synchronization issues with animations, by
   reworking the animation processing model to do a quick restyle and
   incremental layout when ticking animations.
   
   While this change adds overhead to animation ticks, the idea is that
   this will be the fallback when synchronous behavior is required to
   fulfill specification requirements. In the optimistic case, many
   animations could be updated and applied off-the-main-thread and then
   resynchronized when style information is queried by script.
   
   Fixes #13865.

   

   mrobinson committed May 5, 2020
   b585ce5

2. Start having animations conform to the HTML spec …

   This is a small step toward fixing #19242. The main idea is that the
   clock for animations should advance as the event loop ticks. We
   accomplish this by moving the clock from layout and naming it the
   "animation timeline" which is the spec language. This should fix
   flakiness with animations and transitions tests where a reflow could
   move animations forward while script was running.
   
   This change also starts to break out transition and animation events
   into their own data structure, because it's quite likely that the next
   step in fixing #19242 is to no longer send these events through a
   channel.

   

   mrobinson committed May 5, 2020

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