Add gmock into our dependencies.

third_party/boost/boost/fusion/sequence/io/in.hpp

Index: third_party/boost/boost/fusion/sequence/io/in.hpp
diff --git a/third_party/boost/boost/fusion/sequence/io/in.hpp b/third_party/boost/boost/fusion/sequence/io/in.hpp
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+/*=============================================================================
+    Copyright (c) 1999-2003 Jaakko Jarvi
+    Copyright (c) 1999-2003 Jeremiah Willcock
+    Copyright (c) 2001-2006 Joel de Guzman
+
+    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)
+==============================================================================*/
+#if !defined(BOOST_IN_05042005_0120)
+#define BOOST_IN_05042005_0120
+
+#include <istream>
+#include <boost/fusion/sequence/io/detail/in.hpp>
+#include <boost/fusion/support/is_sequence.hpp>
+
+namespace boost { namespace fusion
+{
+    template <typename Sequence>
+    inline std::istream&
+    in(std::istream& is, Sequence& seq)
+    {
+        detail::read_sequence(is, seq);
+        return is;
+    }
+
+    namespace operators
+    {
+        template <typename Sequence>
+        inline typename
+            enable_if<
+               fusion::traits::is_sequence<Sequence>
+              , std::istream&
+            >::type
+        operator>>(std::istream& is, Sequence& seq)
+        {
+            return fusion::in(is, seq);
+        }
+    }
+    using operators::operator>>;
+}}
+
+#endif