Implement reflecting on static fields.

dart/sdk/lib/_internal/compiler/implementation/elements/modelx.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 elements.modelx;
 
 import 'dart:collection' show LinkedHashMap;
 
 import 'elements.dart';
 import '../../compiler.dart' as api;
@@ skipping 1874 matching lines @@
     void fieldFilter(ClassElement enclosingClass, Element member) {
       if (member.isInstanceMember() && member.kind == ElementKind.FIELD) {
         f(enclosingClass, member);
       }
     }
 
     forEachMember(fieldFilter,
         includeSuperAndInjectedMembers: includeSuperAndInjectedMembers);
   }
 
+  /// Similar to [forEachInstanceField] but visits static fields.
+  void forEachStaticField(void f(ClassElement enclosingClass, Element field)) {
+    // Filters so that [f] is only invoked with static fields.
+    void fieldFilter(ClassElement enclosingClass, Element member) {
+      if (!member.isInstanceMember() && member.kind == ElementKind.FIELD) {
+        f(enclosingClass, member);
+      }
+    }
+
+    forEachMember(fieldFilter);
+  }
+
   void forEachBackendMember(void f(Element member)) {
     backendMembers.forEach(f);
   }
 
   bool implementsInterface(ClassElement intrface) {
     for (DartType implementedInterfaceType in allSupertypes) {
       ClassElement implementedInterface = implementedInterfaceType.element;
       if (identical(implementedInterface, intrface)) {
         return true;
       }
@@ skipping 302 matching lines @@
 
   MetadataAnnotation ensureResolved(Compiler compiler) {
     if (resolutionState == STATE_NOT_STARTED) {
       compiler.resolver.resolveMetadataAnnotation(this);
     }
     return this;
   }
 
   String toString() => 'MetadataAnnotation($value, $resolutionState)';
 }