We need to add a Page-level "post rendering frame" hook so we can do things like hook up postRequestAnimationFrame() (webkit.org/b/249798), possibly run the WindowEventLoop (webkit.org/b/249684) and correctly implement Inspectors "frame end" event (webkit.org/b/249796).
<rdar://problem/103648840>
Pull request: https://github.com/WebKit/WebKit/pull/8020
Committed 258311@main (bf82da4c0e3b): <https://commits.webkit.org/258311@main> Reviewed commits have been landed. Closing PR #8020 and removing active labels.