Add gmock into our dependencies.

third_party/boost/boost/fusion/support/detail/is_mpl_sequence.hpp

Index: third_party/boost/boost/fusion/support/detail/is_mpl_sequence.hpp
diff --git a/third_party/boost/boost/fusion/support/detail/is_mpl_sequence.hpp b/third_party/boost/boost/fusion/support/detail/is_mpl_sequence.hpp
new file mode 100644
index 0000000000000000000000000000000000000000..eeb8f91617e54109763753da6c01b8484cb1fff4
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+++ b/third_party/boost/boost/fusion/support/detail/is_mpl_sequence.hpp
@@ -0,0 +1,27 @@
+/*=============================================================================
+    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(FUSION_DETAIL_IS_MPL_SEQUENCE_29122006_1105)
+#define FUSION_DETAIL_IS_MPL_SEQUENCE_29122006_1105
+
+#include <boost/fusion/support/sequence_base.hpp>
+#include <boost/type_traits/is_base_of.hpp>
+#include <boost/mpl/is_sequence.hpp>
+#include <boost/mpl/and.hpp>
+#include <boost/mpl/not.hpp>
+
+namespace boost { namespace fusion { namespace detail
+{
+    template <typename T>
+    struct is_mpl_sequence
+        : mpl::and_<
+            mpl::not_<is_base_of<sequence_root, T> >
+          , mpl::is_sequence<T> >
+    {};
+}}}
+
+#endif