Improve detection of when web views go to background / foreground on iOS.
<rdar://problem/45281182>
Created attachment 367703 [details] Patch
Ping review?
Comment on attachment 367703 [details] Patch Clearing flags on attachment: 367703 Committed r244441: <https://trac.webkit.org/changeset/244441>
All reviewed patches have been landed. Closing bug.