The FECustomFilter is not making the GC3D context active and some platforms are not doing that by default resulting in crashes of uninitialized contexts.
Created attachment 151369 [details] Patch V1
Comment on attachment 151369 [details] Patch V1 Clearing flags on attachment: 151369 Committed r122189: <http://trac.webkit.org/changeset/122189>
All reviewed patches have been landed. Closing bug.