Pull cacheinvalidations code directory into chromium repo.

third_party/cacheinvalidation/src/java/com/google/ipc/invalidation/util/Marshallable.java

 /*
- * Copyright (C) 2009 The Android Open Source Project
+ * Copyright 2011 Google Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
- *      http://www.apache.org/licenses/LICENSE-2.0
+ * http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
- */
+ */
+
+package com.google.ipc.invalidation.util;
+
+/**
+ * Interface for classes that can marshall their state to a protocol buffer.
+ *
+ * @param <T> the type of protocol buffer returned by {@link #marshal}
+ */
+public interface Marshallable<T> {
+  /** Returns a protocol buffer containing the class state. */
+  T marshal();
+}