Document.visibilityState should use an IDL string enumeration: - http://w3c.github.io/page-visibility/#extensions-to-the-document-interface
Created attachment 296951 [details] Patch
Comment on attachment 296951 [details] Patch r=me
Comment on attachment 296951 [details] Patch Clearing flags on attachment: 296951 Committed r209733: <http://trac.webkit.org/changeset/209733>
All reviewed patches have been landed. Closing bug.