Added Google Cache Invalidation library to DEPS and got it to compile

third_party/cacheinvalidation/overrides/google/cacheinvalidation/time.h

Index: third_party/cacheinvalidation/overrides/google/cacheinvalidation/time.h
diff --git a/third_party/cacheinvalidation/overrides/google/cacheinvalidation/time.h b/third_party/cacheinvalidation/overrides/google/cacheinvalidation/time.h
new file mode 100644
index 0000000000000000000000000000000000000000..559b8b8e7365b13918c089b52a9b9e6a711ab5dd
--- /dev/null
+++ b/third_party/cacheinvalidation/overrides/google/cacheinvalidation/time.h
@@ -0,0 +1,16 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef GOOGLE_CACHEINVALIDATION_TIME_H_
+#define GOOGLE_CACHEINVALIDATION_TIME_H_
+
+#include "base/time.h"
+
+namespace invalidation {
+typedef base::Time Time;
+typedef base::TimeTicks TimeTicks;
+typedef base::TimeDelta TimeDelta;
+}  // namespace invalidation
+
+#endif  // GOOGLE_CACHEINVALIDATION_TIME_H_