This is currently unimplemented, and causes lots of OffscreenCanvas failures.
<rdar://problem/113606883>
Pull request: https://github.com/WebKit/WebKit/pull/16510
Committed 266858@main (7bfd3e0384c0): <https://commits.webkit.org/266858@main> Reviewed commits have been landed. Closing PR #16510 and removing active labels.