dart2js: Ensure that typevariables of superclasses are also emitted.

sdk/lib/_internal/compiler/js_lib/js_mirrors.dart

 // Copyright (c) 2013, 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 dart._js_mirrors;
 
 import 'dart:_js_embedded_names' show
     JsGetName,
     ALL_CLASSES,
     LAZIES,
@@ skipping 2152 matching lines @@
     if (!hasSetter) {
       // TODO(ahe): This is a hack to handle checked setters in checked mode.
       var setterName = s('$unmangledName=');
       for (JsMethodMirror method in owner._methods) {
         if (method.simpleName == setterName) {
           isFinal = false;
           break;
         }
       }
     }
-    int type = int.parse(fieldInformation[1]);
+    int type = int.parse(fieldInformation[1], onError: (_) => null);
     return new JsVariableMirror(s(unmangledName),
                                 jsName,
                                 type,
                                 isFinal,
                                 isStatic,
                                 metadataFunction,
                                 owner);
   }
 
   String get _prettyName => 'VariableMirror';
@@ skipping 862 matching lines @@
   // have a part (following a '.') that starts with '_'.
   const int UNDERSCORE = 0x5f;
   if (name.isEmpty) return true;
   int index = -1;
   do {
     if (name.codeUnitAt(index + 1) == UNDERSCORE) return false;
     index = name.indexOf('.', index + 1);
   } while (index >= 0 && index + 1 < name.length);
   return true;
 }