Add gmock into our dependencies.

third_party/boost/boost/mpl/integral_c_tag.hpp

Index: third_party/boost/boost/mpl/integral_c_tag.hpp
diff --git a/third_party/boost/boost/mpl/integral_c_tag.hpp b/third_party/boost/boost/mpl/integral_c_tag.hpp
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index 0000000000000000000000000000000000000000..a2d621b028ba60cb1741ae4093feda91cc8a185d
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+++ b/third_party/boost/boost/mpl/integral_c_tag.hpp
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+
+#ifndef BOOST_MPL_INTEGRAL_C_TAG_HPP_INCLUDED
+#define BOOST_MPL_INTEGRAL_C_TAG_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2004
+//
+// 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)
+//
+// See http://www.boost.org/libs/mpl for documentation.
+
+// $Source$
+// $Date: 2004-09-28 09:56:59 -0400 (Tue, 28 Sep 2004) $
+// $Revision: 25453 $
+
+
+#include <boost/mpl/aux_/adl_barrier.hpp>
+#include <boost/mpl/aux_/config/static_constant.hpp>
+
+BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_OPEN
+struct integral_c_tag { BOOST_STATIC_CONSTANT(int, value = 0); };
+BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_CLOSE
+BOOST_MPL_AUX_ADL_BARRIER_DECL(integral_c_tag)
+
+#endif // BOOST_MPL_INTEGRAL_C_TAG_HPP_INCLUDED