Add gmock into our dependencies.

third_party/boost/boost/mpl/vector/aux_/tag.hpp

Index: third_party/boost/boost/mpl/vector/aux_/tag.hpp
diff --git a/third_party/boost/boost/mpl/vector/aux_/tag.hpp b/third_party/boost/boost/mpl/vector/aux_/tag.hpp
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index 0000000000000000000000000000000000000000..97fee7ad70c1c2e86bd3915414798491b23cbc4d
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+++ b/third_party/boost/boost/mpl/vector/aux_/tag.hpp
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+
+#ifndef BOOST_MPL_VECTOR_AUX_TAG_HPP_INCLUDED
+#define BOOST_MPL_VECTOR_AUX_TAG_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2000-2004
+//
+// 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: 2004-11-27 20:58:27 -0500 (Sat, 27 Nov 2004) $
+// $Revision: 26325 $
+
+#include <boost/mpl/aux_/config/typeof.hpp>
+#include <boost/mpl/aux_/nttp_decl.hpp>
+
+namespace boost { namespace mpl { namespace aux {
+
+struct v_iter_tag;
+
+#if defined(BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES)
+struct vector_tag;
+#else
+template< BOOST_MPL_AUX_NTTP_DECL(long, N) > struct vector_tag;
+#endif
+
+}}}
+
+#endif // BOOST_MPL_VECTOR_AUX_TAG_HPP_INCLUDED