Summary:
In the past I tried a few heuristics to guess when a batch of Animated Operations were ready, and none of these were super reliable. But it turns out we can safely allow JS to manage that explicitly.
Non-Fabric still uses the old behavior which seems fine.
Changelog: [Internal]
Reviewed By: mdvacca
Differential Revision: D23010844
fbshipit-source-id: 4c688d3a61460118557a4971e549ec7457f3eb8f