Add gmock into our dependencies.

third_party/boost/boost/mpl/iterator_tags.hpp

Index: third_party/boost/boost/mpl/iterator_tags.hpp
diff --git a/third_party/boost/boost/mpl/iterator_tags.hpp b/third_party/boost/boost/mpl/iterator_tags.hpp
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index 0000000000000000000000000000000000000000..6db6c295fb30bea58dd510ba6a34b4bc4aefcbb3
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+++ b/third_party/boost/boost/mpl/iterator_tags.hpp
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+
+#ifndef BOOST_MPL_ITERATOR_TAG_HPP_INCLUDED
+#define BOOST_MPL_ITERATOR_TAG_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2000-2004
+//
+// 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)
+//
+// See http://www.boost.org/libs/mpl for documentation.
+
+// $Source$
+// $Date: 2004-11-27 20:58:27 -0500 (Sat, 27 Nov 2004) $
+// $Revision: 26325 $
+
+#include <boost/mpl/int.hpp>
+
+namespace boost { namespace mpl {
+
+struct forward_iterator_tag       : int_<0> { typedef forward_iterator_tag type; };
+struct bidirectional_iterator_tag : int_<1> { typedef bidirectional_iterator_tag type; };
+struct random_access_iterator_tag : int_<2> { typedef random_access_iterator_tag type; };
+
+}}
+
+#endif // BOOST_MPL_ITERATOR_TAG_HPP_INCLUDED