As work towards bug 250510, we should clean up AnimatedPropertyID to be an enum class.
Pull request: https://github.com/WebKit/WebKit/pull/8582
Committed 258865@main (8299608484f7): <https://commits.webkit.org/258865@main> Reviewed commits have been landed. Closing PR #8582 and removing active labels.
<rdar://problem/104211590>