localToAbsolute() and absoluteToLocal() need to correctly map points through 3d transforms, taking perspective and transform-style into account.
Created attachment 27943 [details] Patch, changelog I have extensive test cases, but I can't land them until bug 23943 is landed, and/or we fix hit testing for 3d. So they will come later.
Comment on attachment 27943 [details] Patch, changelog Put TransformState in its own file and don't worry about it being a nested RenderObject struct. Everything else looks fine to me. r=me
http://trac.webkit.org/changeset/41208