It currently supports 'unsigned' hashes only which doesn't have enough independent bits of larger filters.
Created attachment 250158 [details] patch
Created attachment 250159 [details] patch
Comment on attachment 250159 [details] patch Clearing flags on attachment: 250159 Committed r182363: <http://trac.webkit.org/changeset/182363>
All reviewed patches have been landed. Closing bug.