Add gmock into our dependencies.

third_party/boost/boost/preprocessor/array/elem.hpp

Index: third_party/boost/boost/preprocessor/array/elem.hpp
diff --git a/third_party/boost/boost/preprocessor/array/elem.hpp b/third_party/boost/boost/preprocessor/array/elem.hpp
new file mode 100644
index 0000000000000000000000000000000000000000..105ba24e31d61fc1914171562ec50e98772e0680
--- /dev/null
+++ b/third_party/boost/boost/preprocessor/array/elem.hpp
@@ -0,0 +1,29 @@
+# /* **************************************************************************
+#  *                                                                          *
+#  *     (C) Copyright Paul Mensonides 2002.
+#  *     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 for most recent version. */
+#
+# ifndef BOOST_PREPROCESSOR_ARRAY_ELEM_HPP
+# define BOOST_PREPROCESSOR_ARRAY_ELEM_HPP
+#
+# include <boost/preprocessor/array/data.hpp>
+# include <boost/preprocessor/array/size.hpp>
+# include <boost/preprocessor/config/config.hpp>
+# include <boost/preprocessor/tuple/elem.hpp>
+#
+# /* BOOST_PP_ARRAY_ELEM */
+#
+# if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
+#    define BOOST_PP_ARRAY_ELEM(i, array) BOOST_PP_TUPLE_ELEM(BOOST_PP_ARRAY_SIZE(array), i, BOOST_PP_ARRAY_DATA(array))
+# else
+#    define BOOST_PP_ARRAY_ELEM(i, array) BOOST_PP_ARRAY_ELEM_I(i, array)
+#    define BOOST_PP_ARRAY_ELEM_I(i, array) BOOST_PP_TUPLE_ELEM(BOOST_PP_ARRAY_SIZE(array), i, BOOST_PP_ARRAY_DATA(array))
+# endif
+#
+# endif