Setting '-webkit-filter' to 'brightness(calc(10% * 2))' does not work because the CSS parser does not handle calculated values inside brightness().
Created attachment 244099 [details] Patch
Comment on attachment 244099 [details] Patch Clearing flags on attachment: 244099 Committed r178010: <http://trac.webkit.org/changeset/178010>
All reviewed patches have been landed. Closing bug.