Add gmock into our dependencies.

third_party/boost/boost/mpl/aux_/arity.hpp

Index: third_party/boost/boost/mpl/aux_/arity.hpp
diff --git a/third_party/boost/boost/mpl/aux_/arity.hpp b/third_party/boost/boost/mpl/aux_/arity.hpp
new file mode 100644
index 0000000000000000000000000000000000000000..3df45cb49156704738d76b1b28156ed8bdcd16b8
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+++ b/third_party/boost/boost/mpl/aux_/arity.hpp
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+
+#ifndef BOOST_MPL_AUX_ARITY_HPP_INCLUDED
+#define BOOST_MPL_AUX_ARITY_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2001-2004
+//
+// 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: 2004-09-02 11:41:37 -0400 (Thu, 02 Sep 2004) $
+// $Revision: 24874 $
+
+#include <boost/mpl/aux_/config/dtp.hpp>
+
+#if defined(BOOST_MPL_CFG_BROKEN_DEFAULT_PARAMETERS_IN_NESTED_TEMPLATES)
+
+#   include <boost/mpl/aux_/nttp_decl.hpp>
+#   include <boost/mpl/aux_/config/static_constant.hpp>
+
+namespace boost { namespace mpl { namespace aux {
+
+// agurt, 15/mar/02: it's possible to implement the template so that it will 
+// "just work" and do not require any specialization, but not on the compilers
+// that require the arity workaround in the first place
+template< typename F, BOOST_MPL_AUX_NTTP_DECL(int, N) >
+struct arity
+{
+    BOOST_STATIC_CONSTANT(int, value = N);
+};
+
+}}}
+
+#endif // BOOST_MPL_CFG_BROKEN_DEFAULT_PARAMETERS_IN_NESTED_TEMPLATES
+
+#endif // BOOST_MPL_AUX_ARITY_HPP_INCLUDED