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The machinery to report janked animations is; 1) Store the partial pre-rendered animation id and the Animation object in a hashtable in LayerManager 2) Store the animation id in the Animation object as well 3) When we detect jank, we send the animation id to the main-thread via an IPC call 4) Find the Animation object with the id in the hashtable and update the Animaiton 5) Whenever the partial pre-rendered Animation stop running on the compositor i.e. the Animation finished normally, the Animation's target element is changed, etc. etc., remove the Animation from the hashtable Depends on D75731 Differential Revision: https://phabricator.services.mozilla.com/D75732