Implement reflecting on static fields.

dart/sdk/lib/_internal/compiler/implementation/elements/elements.dart

 // 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.
 
 library elements;
 
 
 import 'modelx.dart';
 import '../tree/tree.dart';
 import '../util/util.dart';
@@ skipping 865 matching lines @@
   Element lookupFactoryConstructor(Selector selector,
                                    [Element noMatch(Element)]);
 
   void forEachMember(void f(ClassElement enclosingClass, Element member),
                      {includeBackendMembers: false,
                       includeSuperAndInjectedMembers: false});
 
   void forEachInstanceField(void f(ClassElement enclosingClass, Element field),
                             {includeSuperAndInjectedMembers: false});
 
+  /// Similar to [forEachInstanceField] but visits static fields.
+  void forEachStaticField(void f(ClassElement enclosingClass, Element field));
+
   void forEachBackendMember(void f(Element member));
 }
 
 abstract class MixinApplicationElement extends ClassElement {
   ClassElement get mixin;
   void set mixin(ClassElement value);
   void addConstructor(FunctionElement constructor);
 }
 
 abstract class LabelElement extends Element {
@@ skipping 41 matching lines @@
   int get resolutionState;
   Token get beginToken;
   Token get endToken;
 
   // TODO(kasperl): Try to get rid of these.
   void set annotatedElement(Element value);
   void set resolutionState(int value);
 
   MetadataAnnotation ensureResolved(Compiler compiler);
 }