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When the player state is changed from an event listener callback, we may get recursive listener notifications. These recursions can produce a wrong order, skip or duplicate updates, and send different notifications to different listeners. This change serializes listener notifications by clustering all update data in a helper data class and adding the updates to a queue which can be handled in a loop on the outer layer of the recursion. As playWhenReady updates also reference the current playbackInfo, we need to redirect the listener notifcations for setPlayWhenReady to the same queue. Issue:#4276 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=198031431