Add gmock into our dependencies.

third_party/boost/boost/preprocessor/seq/subseq.hpp

Index: third_party/boost/boost/preprocessor/seq/subseq.hpp
diff --git a/third_party/boost/boost/preprocessor/seq/subseq.hpp b/third_party/boost/boost/preprocessor/seq/subseq.hpp
new file mode 100644
index 0000000000000000000000000000000000000000..fb242f1e69c62873b780a43486af5331a5812019
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+++ b/third_party/boost/boost/preprocessor/seq/subseq.hpp
@@ -0,0 +1,28 @@
+# /* **************************************************************************
+#  *                                                                          *
+#  *     (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_SEQ_SUBSEQ_HPP
+# define BOOST_PREPROCESSOR_SEQ_SUBSEQ_HPP
+#
+# include <boost/preprocessor/config/config.hpp>
+# include <boost/preprocessor/seq/first_n.hpp>
+# include <boost/preprocessor/seq/rest_n.hpp>
+#
+# /* BOOST_PP_SEQ_SUBSEQ */
+#
+# if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
+#    define BOOST_PP_SEQ_SUBSEQ(seq, i, len) BOOST_PP_SEQ_FIRST_N(len, BOOST_PP_SEQ_REST_N(i, seq))
+# else
+#    define BOOST_PP_SEQ_SUBSEQ(seq, i, len) BOOST_PP_SEQ_SUBSEQ_I(seq, i, len)
+#    define BOOST_PP_SEQ_SUBSEQ_I(seq, i, len) BOOST_PP_SEQ_FIRST_N(len, BOOST_PP_SEQ_REST_N(i, seq))
+# endif
+#
+# endif