This currently does not happen, and prevents the scheduler from thinking that it is allowed to begin frames when running DRT in with threaded compositing enabled.
Created attachment 139885 [details] Patch
Comment on attachment 139885 [details] Patch Clearing flags on attachment: 139885 Committed r116344: <http://trac.webkit.org/changeset/116344>
All reviewed patches have been landed. Closing bug.