Accelerated offscreen canvas requires more work to support different skia GL contexts per thread, so fo nor we can use non-accelerated canvas to make offscreen canvas work.
Pull request: https://github.com/WebKit/WebKit/pull/27251
Committed 277496@main (c0cc4c7874ba): <https://commits.webkit.org/277496@main> Reviewed commits have been landed. Closing PR #27251 and removing active labels.
<rdar://problem/126479391>