Defer addStubs to class instantiation time.

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
     ALL_CLASSES,
     LAZIES,
     LIBRARIES,
@@ skipping 1655 matching lines @@
     if (typeVariables.isEmpty)  return _jsConstructor;
     var type = [_jsConstructor];
     for (int i = 0; i < typeVariables.length; i ++) {
       type.add(JsMirrorSystem._dynamicType._asRuntimeType);
     }
     return type;
   }
 
   List<JsMethodMirror> _getMethodsWithOwner(DeclarationMirror methodOwner) {
     var prototype = JS('', '#.prototype', _jsConstructor);
+    // The prototype might not have been processed yet, so do that now.
+    if (JS('bool', '!!#.\$deferredAction', prototype)) {
+      JS('', '#.\$deferredAction()', prototype);
+    }
     List<String> keys = extractKeys(prototype);
     var result = <JsMethodMirror>[];
     for (String key in keys) {
       if (isReflectiveDataInPrototype(key)) continue;
       String simpleName = mangledNames[key];
       // [simpleName] can be null if [key] represents an implementation
       // detail, for example, a bailout method, or runtime type support.
       // It might also be null if the user has limited what is reified for
       // reflection with metadata.
       if (simpleName == null) continue;
@@ skipping 1341 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;
 }