ScriptExecutionContext::processMessagePortMessagesSoon() should only post task when necessary, meaning when there is not already one that is pending.
<rdar://problem/29148465>
Created attachment 294914 [details] Patch
Comment on attachment 294914 [details] Patch r=me
Comment on attachment 294914 [details] Patch Clearing flags on attachment: 294914 Committed r208829: <http://trac.webkit.org/changeset/208829>
All reviewed patches have been landed. Closing bug.