Add gmock into our dependencies.

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

Index: third_party/boost/boost/fusion/adapted/struct/detail/value_at_impl.hpp
diff --git a/third_party/boost/boost/fusion/adapted/struct/detail/value_at_impl.hpp b/third_party/boost/boost/fusion/adapted/struct/detail/value_at_impl.hpp
new file mode 100644
index 0000000000000000000000000000000000000000..8f5d97a0d5779e1757ebedd2ffe7da62968afe14
--- /dev/null
+++ b/third_party/boost/boost/fusion/adapted/struct/detail/value_at_impl.hpp
@@ -0,0 +1,47 @@
+/*=============================================================================
+    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_VALUE_AT_IMPL_24122005_1917)
+#define BOOST_FUSION_VALUE_AT_IMPL_24122005_1917
+
+#include <boost/mpl/if.hpp>
+#include <boost/static_assert.hpp>
+
+namespace boost { namespace fusion
+{
+    struct struct_tag;
+
+    namespace extension
+    {
+        template<typename T>
+        struct value_at_impl;
+
+        template <typename Struct, int N>
+        struct struct_member;
+
+        template <typename Struct>
+        struct struct_size;
+
+        template <>
+        struct value_at_impl<struct_tag>
+        {
+            template <typename Sequence, typename N>
+            struct apply
+            {
+                static int const n_value = N::value;
+                BOOST_MPL_ASSERT_RELATION(
+                    n_value, <=, extension::struct_size<Sequence>::value);
+
+                typedef typename
+                    extension::struct_member<Sequence, N::value>::type
+                type;
+            };
+        };
+    }
+}}
+
+#endif