Add gmock into our dependencies.

third_party/boost/boost/type_traits/is_float.hpp

Index: third_party/boost/boost/type_traits/is_float.hpp
diff --git a/third_party/boost/boost/type_traits/is_float.hpp b/third_party/boost/boost/type_traits/is_float.hpp
new file mode 100644
index 0000000000000000000000000000000000000000..25d16f180030f676980146689da5029125b51134
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+++ b/third_party/boost/boost/type_traits/is_float.hpp
@@ -0,0 +1,27 @@
+
+//  (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
+//  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_TYPE_TRAITS_IS_FLOAT_HPP_INCLUDED
+#define BOOST_TYPE_TRAITS_IS_FLOAT_HPP_INCLUDED
+
+// should be the last #include
+#include <boost/type_traits/detail/bool_trait_def.hpp>
+
+namespace boost {
+
+//* is a type T a floating-point type described in the standard (3.9.1p8)
+BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_float,T,false)
+BOOST_TT_AUX_BOOL_TRAIT_CV_SPEC1(is_float,float,true)
+BOOST_TT_AUX_BOOL_TRAIT_CV_SPEC1(is_float,double,true)
+BOOST_TT_AUX_BOOL_TRAIT_CV_SPEC1(is_float,long double,true)
+
+} // namespace boost
+
+#include <boost/type_traits/detail/bool_trait_undef.hpp>
+
+#endif // BOOST_TYPE_TRAITS_IS_FLOAT_HPP_INCLUDED