fast/scrolling/latching/iframe-latch-small-deltas.html shows some flakey results. Marking flakey while I investigate.
Created attachment 396105 [details] Patch
<rdar://problem/61594742>
https://trac.webkit.org/changeset/259885/webkit
Created attachment 401234 [details] Patch
Created attachment 401235 [details] Patch
Committed r262686: <https://trac.webkit.org/changeset/262686> All reviewed patches have been landed. Closing bug and clearing flags on attachment 401235 [details].