This is in preparation for taking visualOverflowForDecorations into use in IFC.
Created attachment 460135 [details] Patch
Created attachment 460140 [details] Patch
Committed r295444 (251450@main): <https://commits.webkit.org/251450@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 460140 [details].
<rdar://problem/94779432>