Add gmock into our dependencies.

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

Index: third_party/boost/boost/fusion/adapted/struct/detail/is_sequence_impl.hpp
diff --git a/third_party/boost/boost/fusion/adapted/struct/detail/is_sequence_impl.hpp b/third_party/boost/boost/fusion/adapted/struct/detail/is_sequence_impl.hpp
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index 0000000000000000000000000000000000000000..f81e9fb63cb6b0ad3179381901a3d0346e8974fb
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+++ b/third_party/boost/boost/fusion/adapted/struct/detail/is_sequence_impl.hpp
@@ -0,0 +1,31 @@
+/*=============================================================================
+    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_IS_SEQUENCE_IMPL_27122005_1651)
+#define BOOST_FUSION_IS_SEQUENCE_IMPL_27122005_1651
+
+#include <boost/mpl/bool.hpp>
+
+namespace boost { namespace fusion
+{
+    struct struct_tag;
+
+    namespace extension
+    {
+        template<typename Tag>
+        struct is_sequence_impl;
+
+        template<>
+        struct is_sequence_impl<struct_tag>
+        {
+            template<typename Sequence>
+            struct apply : mpl::true_ {};
+        };
+    }
+}}
+
+#endif