Add gmock into our dependencies.

third_party/boost/boost/preprocessor/iteration/local.hpp

Index: third_party/boost/boost/preprocessor/iteration/local.hpp
diff --git a/third_party/boost/boost/preprocessor/iteration/local.hpp b/third_party/boost/boost/preprocessor/iteration/local.hpp
new file mode 100644
index 0000000000000000000000000000000000000000..289fb1aff7c146b489be044a7629c1abdc8bb9bc
--- /dev/null
+++ b/third_party/boost/boost/preprocessor/iteration/local.hpp
@@ -0,0 +1,26 @@
+# /* **************************************************************************
+#  *                                                                          *
+#  *     (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_ITERATION_LOCAL_HPP
+# define BOOST_PREPROCESSOR_ITERATION_LOCAL_HPP
+#
+# include <boost/preprocessor/config/config.hpp>
+# include <boost/preprocessor/slot/slot.hpp>
+# include <boost/preprocessor/tuple/elem.hpp>
+#
+# /* BOOST_PP_LOCAL_ITERATE */
+#
+# define BOOST_PP_LOCAL_ITERATE() <boost/preprocessor/iteration/detail/local.hpp>
+#
+# define BOOST_PP_LOCAL_C(n) (BOOST_PP_LOCAL_S) <= n && (BOOST_PP_LOCAL_F) >= n
+# define BOOST_PP_LOCAL_R(n) (BOOST_PP_LOCAL_F) <= n && (BOOST_PP_LOCAL_S) >= n
+#
+# endif