Our current anti-FOUC mechanism is delaying layer tree unfreezing. This is likely not useful anymore.
rdar://106805458
Pull request: https://github.com/WebKit/WebKit/pull/12427
Committed 262641@main (f59f78a8be0b): <https://commits.webkit.org/262641@main> Reviewed commits have been landed. Closing PR #12427 and removing active labels.