Add gmock into our dependencies.

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

Index: third_party/boost/boost/fusion/adapted/struct.hpp
diff --git a/third_party/boost/boost/fusion/adapted/struct.hpp b/third_party/boost/boost/fusion/adapted/struct.hpp
new file mode 100644
index 0000000000000000000000000000000000000000..c3c24e0b950a3075b5625980e838895f7a21a89c
--- /dev/null
+++ b/third_party/boost/boost/fusion/adapted/struct.hpp
@@ -0,0 +1,28 @@
+/*=============================================================================
+    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_STRUCT_24122005_1744)
+#define BOOST_FUSION_STRUCT_24122005_1744
+
+#include <boost/fusion/adapted/struct/extension.hpp>
+#include <boost/fusion/adapted/struct/adapt_struct.hpp>
+#include <boost/fusion/adapted/struct/adapt_assoc_struct.hpp>
+#include <boost/fusion/adapted/struct/struct_iterator.hpp>
+
+#include <boost/fusion/adapted/struct/detail/at_impl.hpp>
+#include <boost/fusion/adapted/struct/detail/at_key_impl.hpp>
+#include <boost/fusion/adapted/struct/detail/begin_impl.hpp>
+#include <boost/fusion/adapted/struct/detail/category_of_impl.hpp>
+#include <boost/fusion/adapted/struct/detail/end_impl.hpp>
+#include <boost/fusion/adapted/struct/detail/has_key_impl.hpp>
+#include <boost/fusion/adapted/struct/detail/is_sequence_impl.hpp>
+#include <boost/fusion/adapted/struct/detail/is_view_impl.hpp>
+#include <boost/fusion/adapted/struct/detail/size_impl.hpp>
+#include <boost/fusion/adapted/struct/detail/value_at_impl.hpp>
+#include <boost/fusion/adapted/struct/detail/value_at_key_impl.hpp>
+
+#endif