Actually NodeRenderingContext does not need ShadowRoot. It should have ShadowRootList.
Created attachment 128454 [details] Patch
Comment on attachment 128454 [details] Patch makes sense. Please make sure to run by EWS before landing. The patch doesn't seem to apply.
(In reply to comment #2) > (From update of attachment 128454 [details]) > makes sense. Please make sure to run by EWS before landing. The patch doesn't seem to apply. Ah, Sorry. This patch should be apply-able after Bug 79071 is resolved.
Created attachment 128637 [details] Patch
Committed r108728: <http://trac.webkit.org/changeset/108728>