Add gmock into our dependencies.

third_party/boost/boost/version.hpp

Index: third_party/boost/boost/version.hpp
diff --git a/third_party/boost/boost/version.hpp b/third_party/boost/boost/version.hpp
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+//  Boost version.hpp configuration header file  ------------------------------//
+
+//  (C) Copyright John maddock 1999. 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/config for documentation
+
+#ifndef BOOST_VERSION_HPP
+#define BOOST_VERSION_HPP
+
+//
+//  Caution, this is the only boost header that is guarenteed
+//  to change with every boost release, including this header
+//  will cause a recompile every time a new boost version is
+//  released.
+//
+//  BOOST_VERSION % 100 is the patch level
+//  BOOST_VERSION / 100 % 1000 is the minor version
+//  BOOST_VERSION / 100000 is the major version
+
+#define BOOST_VERSION 103600
+
+//
+//  BOOST_LIB_VERSION must be defined to be the same as BOOST_VERSION
+//  but as a *string* in the form "x_y[_z]" where x is the major version
+//  number, y is the minor version number, and z is the patch level if not 0.
+//  This is used by <config/auto_link.hpp> to select which library version to link to.
+
+#define BOOST_LIB_VERSION "1_36"
+
+#endif
+
+
+