Add ClassNodeElement and allow Analyzer to use cached unimplemented members

compiler/java/com/google/dart/compiler/resolver/ClassNodeElement.java

Index: compiler/java/com/google/dart/compiler/resolver/ClassNodeElement.java
diff --git a/compiler/java/com/google/dart/compiler/resolver/ClassNodeElement.java b/compiler/java/com/google/dart/compiler/resolver/ClassNodeElement.java
new file mode 100644
index 0000000000000000000000000000000000000000..c34dbb5d9af935ecd480bb4a4bd07ac0ef816796
--- /dev/null
+++ b/compiler/java/com/google/dart/compiler/resolver/ClassNodeElement.java
@@ -0,0 +1,13 @@
+// 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.
+package com.google.dart.compiler.resolver;
+
+import java.util.List;
+
+public interface ClassNodeElement extends ClassElement, NodeElement {
+  /**
+   * Sets {@link Element}s which as not implemented in this {@link ClassElement}.
+   */
+  void setUnimplementedMembers(List<Element> members);
+}