This is a tracking bug for moving PaintWorklet off the main thread, and instead running in a separate worklet thread managed by the compositor.
Updates will not be posted to this bug; instead it will be blocked by dependent bugs for pieces of the required work.

A partially-complete design doc can be found at https://docs.google.com/document/d/1USTH2Vd4D2tALsvZvy4B2aWotKWjkCYP5m0g7b90RAU/edit?ts=5b7c25a5#heading=h.2zu1g67jbavu (public readable). It will be updated over the next few days with full details from our planning sessions.

(Component likely to change; it is a placeholder to keep this in our tracking.)