The parameter was added in https://bugs.webkit.org/show_bug.cgi?id=94011.
Created attachment 159584 [details] Patch
Comment on attachment 159584 [details] Patch whoops, I thought I added this. Sorry!
Comment on attachment 159584 [details] Patch Clearing flags on attachment: 159584 Committed r126138: <http://trac.webkit.org/changeset/126138>
All reviewed patches have been landed. Closing bug.