Add gmock into our dependencies.

third_party/boost/boost/fusion/sequence/comparison.hpp

Index: third_party/boost/boost/fusion/sequence/comparison.hpp
diff --git a/third_party/boost/boost/fusion/sequence/comparison.hpp b/third_party/boost/boost/fusion/sequence/comparison.hpp
new file mode 100644
index 0000000000000000000000000000000000000000..50e72cb3a417fd26b6df81c65ffaff7f6da0c75c
--- /dev/null
+++ b/third_party/boost/boost/fusion/sequence/comparison.hpp
@@ -0,0 +1,17 @@
+/*=============================================================================
+    Copyright (c) 2001-2006 Joel de Guzman
+
+    Distributed under the Boost Software License, Version 1.0. (See accompanying 
+    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+==============================================================================*/
+#if !defined(FUSION_SEQUENCE_COMPARISON_10022005_0615)
+#define FUSION_SEQUENCE_COMPARISON_10022005_0615
+
+#include <boost/fusion/sequence/comparison/equal_to.hpp>
+#include <boost/fusion/sequence/comparison/greater.hpp>
+#include <boost/fusion/sequence/comparison/greater_equal.hpp>
+#include <boost/fusion/sequence/comparison/less.hpp>
+#include <boost/fusion/sequence/comparison/less_equal.hpp>
+#include <boost/fusion/sequence/comparison/not_equal_to.hpp>
+
+#endif