Add gmock into our dependencies.

third_party/boost/boost/fusion/sequence/comparison/detail/enable_comparison.hpp

Index: third_party/boost/boost/fusion/sequence/comparison/detail/enable_comparison.hpp
diff --git a/third_party/boost/boost/fusion/sequence/comparison/detail/enable_comparison.hpp b/third_party/boost/boost/fusion/sequence/comparison/detail/enable_comparison.hpp
new file mode 100644
index 0000000000000000000000000000000000000000..3e79277ed442a1481ca52947e2376900c24bcbfa
--- /dev/null
+++ b/third_party/boost/boost/fusion/sequence/comparison/detail/enable_comparison.hpp
@@ -0,0 +1,38 @@
+/*=============================================================================
+    Copyright (c) 2001-2006 Joel de Guzman
+
+    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_ENABLE_COMPARISON_09232005_1958)
+#define FUSION_ENABLE_COMPARISON_09232005_1958
+
+#include <boost/mpl/or.hpp>
+#include <boost/mpl/and.hpp>
+#include <boost/mpl/not.hpp>
+#include <boost/mpl/equal_to.hpp>
+#include <boost/fusion/support/is_sequence.hpp>
+#include <boost/fusion/sequence/intrinsic/size.hpp>
+#include <boost/fusion/support/detail/is_mpl_sequence.hpp>
+
+namespace boost { namespace fusion { namespace detail
+{
+    template <typename Sequence>
+    struct is_native_fusion_sequence : is_base_of<sequence_root, Sequence> {};
+
+    template <typename Seq1, typename Seq2>
+    struct enable_equality
+        : mpl::or_<is_native_fusion_sequence<Seq1>, is_native_fusion_sequence<Seq2> >
+    {};
+
+    template <typename Seq1, typename Seq2>
+    struct enable_comparison
+        : mpl::and_<
+            mpl::or_<is_native_fusion_sequence<Seq1>, is_native_fusion_sequence<Seq2> >
+          , mpl::equal_to<result_of::size<Seq1>, result_of::size<Seq2> > 
+        >
+    {};
+
+}}}
+
+#endif