Add gmock into our dependencies.

third_party/boost/boost/type_traits/is_complex.hpp

Index: third_party/boost/boost/type_traits/is_complex.hpp
diff --git a/third_party/boost/boost/type_traits/is_complex.hpp b/third_party/boost/boost/type_traits/is_complex.hpp
new file mode 100644
index 0000000000000000000000000000000000000000..9ccc333cb2ba4fa5be13fd6f6c7013631e47e890
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+++ b/third_party/boost/boost/type_traits/is_complex.hpp
@@ -0,0 +1,34 @@
+//  (C) Copyright John Maddock 2007. 
+//  Use, modification and distribution are subject to 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/type_traits for most recent version including documentation.
+
+#ifndef BOOST_TT_IS_COMPLEX_HPP
+#define BOOST_TT_IS_COMPLEX_HPP
+
+#include <boost/type_traits/is_convertible.hpp>
+#include <complex>
+// should be the last #include
+#include <boost/type_traits/detail/bool_trait_def.hpp>
+
+
+namespace boost {
+namespace detail{
+
+struct is_convertible_from_tester
+{
+   template <class T>
+   is_convertible_from_tester(const std::complex<T>&);
+};
+
+}
+
+BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_complex,T,(::boost::is_convertible<T, detail::is_convertible_from_tester>::value))
+
+} // namespace boost
+
+#include <boost/type_traits/detail/bool_trait_undef.hpp>
+
+#endif //BOOST_TT_IS_COMPLEX_HPP