Implement reflecting on static fields.

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

Index: dart/sdk/lib/_internal/compiler/implementation/elements/modelx.dart
diff --git a/dart/sdk/lib/_internal/compiler/implementation/elements/modelx.dart b/dart/sdk/lib/_internal/compiler/implementation/elements/modelx.dart
index 58c23443c05a05cf1ada8e72d587754292e46156..76b16e4be3d39777100247c1f9db35e322f1491d 100644
--- a/dart/sdk/lib/_internal/compiler/implementation/elements/modelx.dart
+++ b/dart/sdk/lib/_internal/compiler/implementation/elements/modelx.dart
@@ -1892,6 +1892,18 @@ abstract class BaseClassElementX extends ElementX implements ClassElement {
         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);
   }