FileWriterSync could be used in filesystem FileWriter in worker thread, so we should add ProgressEvent in idl file.
Created attachment 144318 [details] Patch
Comment on attachment 144318 [details] Patch Covered by existing tests, no regressions on any platform according to bots. reasonable change. r+
Comment on attachment 144318 [details] Patch Clearing flags on attachment: 144318 Committed r118700: <http://trac.webkit.org/changeset/118700>
All reviewed patches have been landed. Closing bug.