This is part of bug 225731 activity.
Created attachment 428504 [details] Patch
Created attachment 428742 [details] Patch
Created attachment 428743 [details] Patch
Committed r277549 (237777@main): <https://commits.webkit.org/237777@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 428743 [details].
<rdar://problem/78064643>