Add gmock into our dependencies.

third_party/boost/boost/type.hpp

Index: third_party/boost/boost/type.hpp
diff --git a/third_party/boost/boost/type.hpp b/third_party/boost/boost/type.hpp
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+// (C) Copyright David Abrahams 2001.
+// 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)
+
+#ifndef BOOST_TYPE_DWA20010120_HPP
+# define BOOST_TYPE_DWA20010120_HPP
+
+namespace boost {
+
+  // Just a simple "type envelope". Useful in various contexts, mostly to work
+  // around some MSVC deficiencies.
+  template <class T>
+  struct type {};
+
+}
+
+#endif // BOOST_TYPE_DWA20010120_HPP