[iOS] All home screen web apps resume when any home screen web app is foregrounded
<rdar://72949281>
Created attachment 434120 [details] Patch
Created attachment 434129 [details] Patch
Committed r280298 (239951@main): <https://commits.webkit.org/239951@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 434129 [details].