Stack statistics collection mechanism was introduced in http://trac.webkit.org/changeset/131938 , but the new files weren't added to EFL and GTK build files.
Created attachment 224753 [details] Patch
Comment on attachment 224753 [details] Patch Clearing flags on attachment: 224753 Committed r164430: <http://trac.webkit.org/changeset/164430>
All reviewed patches have been landed. Closing bug.