Add gmock into our dependencies.

third_party/boost/boost/type_traits/is_union.hpp

Index: third_party/boost/boost/type_traits/is_union.hpp
diff --git a/third_party/boost/boost/type_traits/is_union.hpp b/third_party/boost/boost/type_traits/is_union.hpp
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index 0000000000000000000000000000000000000000..25bddccfe1a7fcbf20caac47ca2190c9640d41a4
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+++ b/third_party/boost/boost/type_traits/is_union.hpp
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+
+//  (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, Howard
+//  Hinnant & John Maddock 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.
+
+
+#ifndef BOOST_TT_IS_UNION_HPP_INCLUDED
+#define BOOST_TT_IS_UNION_HPP_INCLUDED
+
+#include <boost/type_traits/remove_cv.hpp>
+#include <boost/type_traits/config.hpp>
+#include <boost/type_traits/intrinsics.hpp>
+
+// should be the last #include
+#include <boost/type_traits/detail/bool_trait_def.hpp>
+
+namespace boost {
+
+namespace detail {
+#ifndef __GNUC__
+template <typename T> struct is_union_impl
+{
+   typedef typename remove_cv<T>::type cvt;
+   BOOST_STATIC_CONSTANT(bool, value = BOOST_IS_UNION(cvt));
+};
+#else
+//
+// using remove_cv here generates a whole load of needless
+// warnings with gcc, since it doesn't do any good with gcc
+// in any case (at least at present), just remove it:
+//
+template <typename T> struct is_union_impl
+{
+   BOOST_STATIC_CONSTANT(bool, value = BOOST_IS_UNION(T));
+};
+#endif
+} // namespace detail
+
+BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_union,T,::boost::detail::is_union_impl<T>::value)
+
+} // namespace boost
+
+#include <boost/type_traits/detail/bool_trait_undef.hpp>
+
+#endif // BOOST_TT_IS_UNION_HPP_INCLUDED