libcache will listen for OS memory notification, but needs some prodding for the tab suspension case on iOS, as well as the memory pressure simulation code path.
Created attachment 247350 [details] Patch
Comment on attachment 247350 [details] Patch r=me but this probably requires yosemite.
<rdar://problem/19966096>
Created attachment 247409 [details] Patch for landing
Comment on attachment 247409 [details] Patch for landing Clearing flags on attachment: 247409 Committed r180666: <http://trac.webkit.org/changeset/180666>
All reviewed patches have been landed. Closing bug.