Add gmock into our dependencies.

third_party/boost/boost/fusion/adapted/struct/detail/begin_impl.hpp

Index: third_party/boost/boost/fusion/adapted/struct/detail/begin_impl.hpp
diff --git a/third_party/boost/boost/fusion/adapted/struct/detail/begin_impl.hpp b/third_party/boost/boost/fusion/adapted/struct/detail/begin_impl.hpp
new file mode 100644
index 0000000000000000000000000000000000000000..bf5a00bccadcf79cc6629edf57f93189ffab088e
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+++ b/third_party/boost/boost/fusion/adapted/struct/detail/begin_impl.hpp
@@ -0,0 +1,40 @@
+/*=============================================================================
+    Copyright (c) 2001-2006 Joel de Guzman
+    Copyright (c) 2005-2006 Dan Marsden
+
+    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_FUSION_BEGIN_IMPL_24122005_1752)
+#define BOOST_FUSION_BEGIN_IMPL_24122005_1752
+
+#include <boost/fusion/adapted/struct/struct_iterator.hpp>
+
+namespace boost { namespace fusion
+{
+    struct struct_tag;
+
+    namespace extension
+    {
+        template<typename T>
+        struct begin_impl;
+
+        template <>
+        struct begin_impl<struct_tag>
+        {
+            template <typename Sequence>
+            struct apply
+            {
+                typedef struct_iterator<Sequence, 0> type;
+
+                static type
+                call(Sequence& v)
+                {
+                    return type(v);
+                }
+            };
+        };
+    }
+}}
+
+#endif