As part of the threaded animation resolution work we will use the scrolling thread to resolve animations in the UI process, so we must make sure that code is compiled everywhere threaded animation resolution is enabled.
<rdar://problem/118881620>
Pull request: https://github.com/WebKit/WebKit/pull/20997
Committed 271231@main (d923177aecf4): <https://commits.webkit.org/271231@main> Reviewed commits have been landed. Closing PR #20997 and removing active labels.