Pull cacheinvalidations code directory into chromium repo.

third_party/cacheinvalidation/src/java/com/google/ipc/invalidation/ticl/android2/AndroidClock.java

Index: third_party/cacheinvalidation/src/java/com/google/ipc/invalidation/ticl/android2/AndroidClock.java
diff --git a/third_party/cacheinvalidation/src/java/com/google/ipc/invalidation/ticl/android2/AndroidClock.java b/third_party/cacheinvalidation/src/java/com/google/ipc/invalidation/ticl/android2/AndroidClock.java
new file mode 100644
index 0000000000000000000000000000000000000000..84bd15f676f586b37381978466c82f79b40c0560
--- /dev/null
+++ b/third_party/cacheinvalidation/src/java/com/google/ipc/invalidation/ticl/android2/AndroidClock.java
@@ -0,0 +1,36 @@
+/*
+ * 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
+ *
+ * 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.ticl.android2;
+
+/**
+ * Interface for the Android Ticl that provides a source of time.
+ *
+ */
+public interface AndroidClock {
+  /**
+   * Implementation of {@code AndroidClock} that uses {@link System#currentTimeMillis()}.
+   */
+  static class SystemClock implements AndroidClock {
+    @Override
+    public long nowMs() {
+      return System.currentTimeMillis();
+    }
+  }
+
+  /** Returns milliseconds elapsed since the Unix epoch. */
+  long nowMs();
+}