Commits on Sep 17, 2025

1. Log Performance Track Entries for View Transitions (#34510) …

   Stacked on #34509.
   
   View Transitions introduces a bunch of new types of gaps in the commit
   phase which needs to be logged differently in the performance track.
   
   One thing that can happen is that a `flushSync` update forces the View
   Transition to abort before it has started if it happens in the gap
   before the transition is ready. In that case we log "Interrupted View
   Transition".
   
   Otherwise, when we're done in `startViewTransition` there's some work to
   finalize the animations before the `ready` calllback. This is logged as
   "Starting Animation".
   
   Then there's a gap before the passive effects fire which we log as
   "Animating". This can be long unless they're forced to flush early e.g.
   due to another lane updating.
   
   The "Animating" track should then pick up which doesn't do yet. This one
   is tricky because this is after the actual commit phase and needs to be
   interrupted by new renders which themselves can be suspended on the
   animation finshing.
   
   This PR is just a subset of all the cases. Will need a lot more work.
   
   <img width="679" height="161" alt="Screenshot 2025-09-16 at 10 19 06 PM"
   src="https://github.com/user-attachments/assets/0407372d-aaed-41f5-a262-059b2686ae87"
   />

   

   sebmarkbage authored Sep 17, 2025
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