Alt, Shift and Ctrl keys are not handled by EventSenderProxy. It causes failure of fast/events/keydown-leftright-keys.html test.
Created attachment 154327 [details] patch
Comment on attachment 154327 [details] patch LGTM.
Comment on attachment 154327 [details] patch Clearing flags on attachment: 154327 Committed r123647: <http://trac.webkit.org/changeset/123647>
All reviewed patches have been landed. Closing bug.