We have been implementing constructors of Events. OverflowEvent has a constructor in JSC (bug 69907), but does not have it in V8.
Created attachment 110830 [details] Patch
Created attachment 110937 [details] rebased patch for commit
Comment on attachment 110937 [details] rebased patch for commit Clearing flags on attachment: 110937 Committed r97431: <http://trac.webkit.org/changeset/97431>
Attachment 110830 [details] was posted by a committer and has review+, assigning to Kentaro Hara for commit.