Roll cacheinvalidation to @307 and add OWNERS file for the directory.

third_party/cacheinvalidation/overrides/google/cacheinvalidation/deps/random.cc

Index: third_party/cacheinvalidation/overrides/google/cacheinvalidation/deps/random.cc
===================================================================
--- third_party/cacheinvalidation/overrides/google/cacheinvalidation/deps/random.cc	(revision 0)
+++ third_party/cacheinvalidation/overrides/google/cacheinvalidation/deps/random.cc	(revision 0)
@@ -0,0 +1,17 @@
+// Copyright (c) 2013 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.
+
+#include "google/cacheinvalidation/deps/random.h"
+
+namespace invalidation {
+
+double Random::RandDouble() {
+  return base::RandDouble();
+}
+
+uint64 Random::RandUint64() {
+  return base::RandUint64();
+}
+
+}  // namespace invalidation