Canvas API. There are still a number of things to do:

samples/openglui/web/raytrace_driver.dart

Index: samples/openglui/web/raytrace_driver.dart
===================================================================
--- samples/openglui/web/raytrace_driver.dart	(revision 17737)
+++ samples/openglui/web/raytrace_driver.dart	(working copy)
@@ -1,12 +0,0 @@
-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'gl_driver.dart';
-// TODO(vsm): Make this a package URL.
-import '../src/raytrace.dart';
-
-main() {
-  wrapVertexArray = true;
-  glMain(setup, resize, update);
-}