Implement raw list checks.

pkg/compiler/lib/src/js_backend/codegen/codegen.dart

 // Copyright (c) 2014, 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.
 
 library code_generator;
 
 import 'glue.dart';
 
 import '../../tree_ir/tree_ir_nodes.dart' as tree_ir;
 import '../../js/js.dart' as js;
@@ skipping 340 matching lines @@
   js.Expression visitThis(tree_ir.This node) {
     return new js.This();
   }
 
   @override
   js.Expression visitTypeOperator(tree_ir.TypeOperator node) {
     if (!node.isTypeTest) {
       giveup(node, 'type casts not implemented.');
     }
     DartType type = node.type;
-    if (type is InterfaceType && type.typeArguments.isEmpty) {
+    if (type is InterfaceType && type.isRaw) {
       glue.registerIsCheck(type, registry);
       js.Expression value = visitExpression(node.receiver);
       return emitSubtypeTest(node, value, type);
     }
     return giveup(node, 'type check unimplemented for $type.');
   }
 
   @override
   js.Expression visitVariableUse(tree_ir.VariableUse node) {
     return buildVariableAccess(node.variable);
@@ skipping 294 matching lines @@
 
   @override
   visitVariableDeclaration(tree_ir.VariableDeclaration node) {
     return errorUnsupportedNode(node);
   }
 
   errorUnsupportedNode(tree_ir.DartSpecificNode node) {
     throw "Unsupported node in JS backend: $node";
   }
 }