I haven't looked at the code yet, but one big thing is how does it handle browsers that don't support it? Traditionally core GWT only supported things that could at least be emulated everywhere, though "recently" some things like Canvas were added which introduced a partial support model. It would be good if WebGL used the same model.
Docs and tests are necessary for going into GWT -- that doesn't mean you have to write them, but it has to get done by someone before it can go in. -- John A. Tamplin Software Engineer (GWT), Google -- http://groups.google.com/group/Google-Web-Toolkit-Contributors
