This was super helpful in debugging things.
Created attachment 375186 [details] patch
Comment on attachment 375186 [details] patch r=me
Created attachment 375188 [details] patch for landing
Comment on attachment 375188 [details] patch for landing Clearing flags on attachment: 375188 Committed r248021: <https://trac.webkit.org/changeset/248021>
All reviewed patches have been landed. Closing bug.
<rdar://problem/53734655>