Add gmock into our dependencies.

third_party/boost/boost/fusion/iterator/prior.hpp

Index: third_party/boost/boost/fusion/iterator/prior.hpp
diff --git a/third_party/boost/boost/fusion/iterator/prior.hpp b/third_party/boost/boost/fusion/iterator/prior.hpp
new file mode 100644
index 0000000000000000000000000000000000000000..9a26103967dbcab002ec2eb69a0154bd3b6c9885
--- /dev/null
+++ b/third_party/boost/boost/fusion/iterator/prior.hpp
@@ -0,0 +1,63 @@
+/*=============================================================================
+    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(FUSION_PRIOR_05042005_1144)
+#define FUSION_PRIOR_05042005_1144
+
+#include <boost/fusion/support/tag_of.hpp>
+
+namespace boost { namespace fusion
+{
+    // Special tags:
+    struct iterator_facade_tag; // iterator facade tag
+    struct array_iterator_tag; // boost::array iterator tag
+    struct mpl_iterator_tag; // mpl sequence iterator tag
+    struct std_pair_iterator_tag; // std::pair iterator tag
+
+    namespace extension
+    {
+        template <typename Tag>
+        struct prior_impl
+        {
+            template <typename Iterator>
+            struct apply {};
+        };
+
+        template <>
+        struct prior_impl<iterator_facade_tag>
+        {
+            template <typename Iterator>
+            struct apply : Iterator::template prior<Iterator> {};
+        };
+
+        template <>
+        struct prior_impl<array_iterator_tag>;
+
+        template <>
+        struct prior_impl<mpl_iterator_tag>;
+
+        template <>
+        struct prior_impl<std_pair_iterator_tag>;
+    }
+
+    namespace result_of
+    {
+        template <typename Iterator>
+        struct prior
+            : extension::prior_impl<typename detail::tag_of<Iterator>::type>::
+                template apply<Iterator>
+        {};
+    }
+
+    template <typename Iterator>
+    typename result_of::prior<Iterator>::type const
+    prior(Iterator const& i)
+    {
+        return result_of::prior<Iterator>::call(i);
+    }
+}}
+
+#endif