Make CacheStorage::Engine directory listing operations in a background thread
Created attachment 373423 [details] Patch
Created attachment 373431 [details] Patch
Comment on attachment 373431 [details] Patch r=me if the bots are happy
Comment on attachment 373431 [details] Patch Clearing flags on attachment: 373431 Committed r247125: <https://trac.webkit.org/changeset/247125>
All reviewed patches have been landed. Closing bug.
<rdar://problem/52622561>