Add support for local variables(including parameters) to cps->js.

pkg/compiler/lib/src/js_backend/codegen/glue.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_dependencies;
 
 import '../js_backend.dart';
 import '../../dart2jslib.dart';
 import '../../js_emitter/js_emitter.dart';
 import '../../js/js.dart' as js;
@@ skipping 14 matching lines @@
   Glue(this._compiler);
 
   js.Expression constantReference(ConstantValue value) {
     return _emitter.constantReference(value);
   }
 
   js.Expression elementAccess(Element element) {
     return _namer.elementAccess(element);
   }
 
+  String safeVariableName(String name) {
+    return _namer.safeVariableName(name);
+  }
+
 }