Andrew Osmond 458224e190 Bug 1870957 - Part 4. Refactor canvas shutdown to be synchronized with CanvasManagerChild. r=lsalzman
Because we cannot control the ordering of shutdown notification from
WorkerRef, we need to choose one centralized point to begin shutdown of
the main thread or the owning DOM worker. Since there are other objects
owned by CanvasManagerChild, we also switch to a ThreadSafeWorkerRef.

Differential Revision: https://phabricator.services.mozilla.com/D195120
2023-12-20 13:01:19 +00:00
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