Detailed discovery mode isn't needed when the page isn't visible, so switch to disabled when the document visibility changes to hidden.
<rdar://problem/20847009>
Created attachment 257678 [details] Proposed patch
Comment on attachment 257678 [details] Proposed patch Clearing flags on attachment: 257678 Committed r187516: <http://trac.webkit.org/changeset/187516>
All reviewed patches have been landed. Closing bug.