Add gmock into our dependencies.

third_party/boost/boost/type_traits/detail/bool_trait_undef.hpp

Index: third_party/boost/boost/type_traits/detail/bool_trait_undef.hpp
diff --git a/third_party/boost/boost/type_traits/detail/bool_trait_undef.hpp b/third_party/boost/boost/type_traits/detail/bool_trait_undef.hpp
new file mode 100644
index 0000000000000000000000000000000000000000..2259c644f2d61a42fb9cd515123cf7c61e5e0824
--- /dev/null
+++ b/third_party/boost/boost/type_traits/detail/bool_trait_undef.hpp
@@ -0,0 +1,27 @@
+
+// NO INCLUDE GUARDS, THE HEADER IS INTENDED FOR MULTIPLE INCLUSION
+
+// Copyright Aleksey Gurtovoy 2002-2004
+//
+// 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)
+
+// $Source$
+// $Date: 2004-09-02 11:41:37 -0400 (Thu, 02 Sep 2004) $
+// $Revision: 24874 $
+
+#undef BOOST_TT_AUX_BOOL_TRAIT_VALUE_DECL
+#undef BOOST_TT_AUX_BOOL_C_BASE
+#undef BOOST_TT_AUX_BOOL_TRAIT_DEF1
+#undef BOOST_TT_AUX_BOOL_TRAIT_DEF2
+#undef BOOST_TT_AUX_BOOL_TRAIT_SPEC1
+#undef BOOST_TT_AUX_BOOL_TRAIT_SPEC2
+#undef BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1
+#undef BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC2
+#undef BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1
+#undef BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_2
+#undef BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC2_1
+#undef BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC2_2
+#undef BOOST_TT_AUX_BOOL_TRAIT_IMPL_PARTIAL_SPEC2_1
+#undef BOOST_TT_AUX_BOOL_TRAIT_CV_SPEC1