According to the patch in bug https://bugs.webkit.org/show_bug.cgi?id=126122, we need to mark the non composited layer as non composited.
Created attachment 272113 [details]
Comment on attachment 272113 [details]
Clearing flags on attachment: 272113
Committed r197031: <http://trac.webkit.org/changeset/197031>
All reviewed patches have been landed. Closing bug.
Thanks for reviewing :)