Add gmock into our dependencies.

third_party/boost/boost/mpl/aux_/config/pp_counter.hpp

Index: third_party/boost/boost/mpl/aux_/config/pp_counter.hpp
diff --git a/third_party/boost/boost/mpl/aux_/config/pp_counter.hpp b/third_party/boost/boost/mpl/aux_/config/pp_counter.hpp
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index 0000000000000000000000000000000000000000..b2a16446bcdd55ca71c0d2963042cdb51568413d
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+++ b/third_party/boost/boost/mpl/aux_/config/pp_counter.hpp
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+
+#ifndef BOOST_MPL_AUX_CONFIG_PP_COUNTER_HPP_INCLUDED
+#define BOOST_MPL_AUX_CONFIG_PP_COUNTER_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2006
+//
+// 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: 2007-11-25 13:07:19 -0500 (Sun, 25 Nov 2007) $
+// $Revision: 41369 $
+
+#if !defined(BOOST_MPL_AUX_PP_COUNTER)
+#   include <boost/mpl/aux_/config/msvc.hpp>
+#   if BOOST_WORKAROUND(BOOST_MSVC, >= 1300)
+#       define BOOST_MPL_AUX_PP_COUNTER() __COUNTER__
+#   else
+#       define BOOST_MPL_AUX_PP_COUNTER() __LINE__
+#   endif
+#endif
+
+#endif // BOOST_MPL_AUX_CONFIG_PP_COUNTER_HPP_INCLUDED