Summary:
Changes `peek`->`poll` on Animated node queues to a single `poll`, accounting for race conditions. In case the queue batch is split at some point, previously polled operation is kept as a "carry-over" inside the queue abstraction.
Changelog: [Internal]
Reviewed By: JoshuaGross
Differential Revision: D34377737
fbshipit-source-id: 78e5ca60c4777576fbf009c3d3ffa53629221910