Add gmock into our dependencies.

third_party/boost/boost/fusion/sequence/intrinsic/begin.hpp

Index: third_party/boost/boost/fusion/sequence/intrinsic/begin.hpp
diff --git a/third_party/boost/boost/fusion/sequence/intrinsic/begin.hpp b/third_party/boost/boost/fusion/sequence/intrinsic/begin.hpp
new file mode 100644
index 0000000000000000000000000000000000000000..715ef9e1c7f60168537f9100e22185e2ad5d5b03
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+++ b/third_party/boost/boost/fusion/sequence/intrinsic/begin.hpp
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+/*=============================================================================
+    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_BEGIN_04052005_1132)
+#define FUSION_BEGIN_04052005_1132
+
+#include <boost/fusion/support/tag_of.hpp>
+
+namespace boost { namespace fusion
+{
+    // Special tags:
+    struct sequence_facade_tag; // iterator facade tag
+    struct boost_tuple_tag; // boost::tuples::tuple tag
+    struct array_tag; // boost::array tag
+    struct mpl_sequence_tag; // mpl sequence tag
+    struct std_pair_tag; // std::pair tag
+
+    namespace extension
+    {
+        template <typename Tag>
+        struct begin_impl
+        {
+            template <typename Sequence>
+            struct apply;
+        };
+
+        template <>
+        struct begin_impl<sequence_facade_tag>
+        {
+            template <typename Sequence>
+            struct apply : Sequence::template begin<Sequence> {};
+        };
+
+        template <>
+        struct begin_impl<boost_tuple_tag>;
+
+        template <>
+        struct begin_impl<array_tag>;
+
+        template <>
+        struct begin_impl<mpl_sequence_tag>;
+
+        template <>
+        struct begin_impl<std_pair_tag>;
+    }
+
+    namespace result_of
+    {
+        template <typename Sequence>
+        struct begin
+            : extension::begin_impl<typename detail::tag_of<Sequence>::type>::
+                template apply<Sequence>
+        {};
+    }
+
+    template <typename Sequence>
+    inline typename result_of::begin<Sequence>::type const
+    begin(Sequence& seq)
+    {
+        return result_of::begin<Sequence>::call(seq);
+    }
+
+    template <typename Sequence>
+    inline typename result_of::begin<Sequence const>::type const
+    begin(Sequence const& seq)
+    {
+        return result_of::begin<Sequence const>::call(seq);
+    }
+}}
+
+#endif