040000 tree 2f795fc3bfdbacbbdf5ecff750415c29abff1fb6	irt_stub
040000 tree b229bd97f768e81cc410cbd4560634236dad9941	pnacl_irt_shim
040000 tree 404a5cf5648b76628bf8f048fad44d00bc36763f	pnacl_support_extension