Add gmock into our dependencies.

third_party/boost/boost/type_traits/detail/yes_no_type.hpp

Index: third_party/boost/boost/type_traits/detail/yes_no_type.hpp
diff --git a/third_party/boost/boost/type_traits/detail/yes_no_type.hpp b/third_party/boost/boost/type_traits/detail/yes_no_type.hpp
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index 0000000000000000000000000000000000000000..f583730220ee024b8933d5131079ac80fb2ccfe2
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+++ b/third_party/boost/boost/type_traits/detail/yes_no_type.hpp
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+
+//  (C) Copyright John Maddock and Steve Cleary 2000.
+//  Use, modification and distribution are subject to 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/type_traits for most recent version including documentation.
+//
+//  macros and helpers for working with integral-constant-expressions.
+
+#ifndef BOOST_TT_DETAIL_YES_NO_TYPE_HPP_INCLUDED
+#define BOOST_TT_DETAIL_YES_NO_TYPE_HPP_INCLUDED
+
+namespace boost {
+namespace type_traits {
+
+typedef char yes_type;
+struct no_type
+{
+   char padding[8];
+};
+
+} // namespace type_traits
+} // namespace boost
+
+#endif // BOOST_TT_DETAIL_YES_NO_TYPE_HPP_INCLUDED