WebCodecs encoders should be able to handle encoding synchronously two frames with the same timestamp
<rdar://problem/111389746>
Pull request: https://github.com/WebKit/WebKit/pull/15330
*** Bug 258569 has been marked as a duplicate of this bug. ***
Committed 265580@main (9d258046f92b): <https://commits.webkit.org/265580@main> Reviewed commits have been landed. Closing PR #15330 and removing active labels.