When clicking on the context menu, the selection flashes the menu item and a checkmark appears to its left.
Created attachment 255498 [details]
Created attachment 255503 [details]
Comment on attachment 255503 [details]
Clearing flags on attachment: 255503
Committed r185922: <http://trac.webkit.org/changeset/185922>
All reviewed patches have been landed. Closing bug.