Fixing WebGLLoseContext on Firefox.

sdk/lib/web_gl/dart2js/web_gl_dart2js.dart

 library dart.dom.web_gl;
 
 import 'dart:collection';
 import 'dart:_collection-dev' hide deprecated;
 import 'dart:html';
 import 'dart:html_common';
 import 'dart:typed_data';
 import 'dart:_js_helper' show Creates, JSName, Null, Returns, convertDartClosureToJS;
 import 'dart:_foreign_helper' show JS;
 import 'dart:_interceptors' show Interceptor, JSExtendableArray;
@@ skipping 708 matching lines @@
 }
 // 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.
 
 
 @DocsEditable()
 @DomName('WebGLLoseContext')
 // http://www.khronos.org/registry/webgl/extensions/WEBGL_lose_context/
 @Experimental()
-class LoseContext extends Interceptor native "WebGLLoseContext" {
+class LoseContext extends Interceptor native "WebGLLoseContext,WebGLExtensionLoseContext" {
 
   @DomName('WebGLLoseContext.loseContext')
   @DocsEditable()
   void loseContext() native;
 
   @DomName('WebGLLoseContext.restoreContext')
   @DocsEditable()
   void restoreContext() native;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
@@ skipping 2051 matching lines @@
 // 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.
 
 
 @DocsEditable()
 @DomName('WebGLVertexArrayObjectOES')
 // http://www.khronos.org/registry/webgl/extensions/OES_vertex_array_object/
 @Experimental() // experimental
 class VertexArrayObject extends Interceptor native "WebGLVertexArrayObjectOES" {
 }