Commits on May 1, 2020

1. Add support for animationend event …

   This is triggered when an animation finishes. This is a high priority
   because it allows us to start rooting nodes with animations in the
   script thread.
   
   This doesn't yet cause a lot of tests to pass because they rely on the
   existence of `Document.getAnimations()` and the presence of
   `animationstart` and animationiteration` events.

   

   mrobinson committed May 1, 2020

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