Add gmock into our dependencies.

third_party/boost/boost/config/platform/macos.hpp

Index: third_party/boost/boost/config/platform/macos.hpp
diff --git a/third_party/boost/boost/config/platform/macos.hpp b/third_party/boost/boost/config/platform/macos.hpp
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+//  (C) Copyright John Maddock 2001 - 2003. 
+//  (C) Copyright Darin Adler 2001 - 2002. 
+//  (C) Copyright Bill Kempf 2002. 
+//  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 for most recent version.
+
+//  Mac OS specific config options:
+
+#define BOOST_PLATFORM "Mac OS"
+
+#if __MACH__ && !defined(_MSL_USING_MSL_C)
+
+// Using the Mac OS X system BSD-style C library.
+
+#  ifndef BOOST_HAS_UNISTD_H
+#    define BOOST_HAS_UNISTD_H
+#  endif
+//
+// Begin by including our boilerplate code for POSIX
+// feature detection, this is safe even when using
+// the MSL as Metrowerks supply their own <unistd.h>
+// to replace the platform-native BSD one. G++ users
+// should also always be able to do this on MaxOS X.
+//
+#  include <boost/config/posix_features.hpp>
+#  ifndef BOOST_HAS_STDINT_H
+#     define BOOST_HAS_STDINT_H
+#  endif
+
+//
+// BSD runtime has pthreads, sigaction, sched_yield and gettimeofday,
+// of these only pthreads are advertised in <unistd.h>, so set the 
+// other options explicitly:
+//
+#  define BOOST_HAS_SCHED_YIELD
+#  define BOOST_HAS_GETTIMEOFDAY
+#  define BOOST_HAS_SIGACTION
+
+#  if (__GNUC__ < 3) && !defined( __APPLE_CC__)
+
+// GCC strange "ignore std" mode works better if you pretend everything
+// is in the std namespace, for the most part.
+
+#    define BOOST_NO_STDC_NAMESPACE
+#  endif
+
+#  if (__GNUC__ == 4)
+
+// Both gcc and intel require these.  
+#    define BOOST_HAS_PTHREAD_MUTEXATTR_SETTYPE
+#    define BOOST_HAS_NANOSLEEP
+
+#  endif
+
+#else
+
+// Using the MSL C library.
+
+// We will eventually support threads in non-Carbon builds, but we do
+// not support this yet.
+#  if ( defined(TARGET_API_MAC_CARBON) && TARGET_API_MAC_CARBON ) || ( defined(TARGET_CARBON) && TARGET_CARBON )
+
+#  if !defined(BOOST_HAS_PTHREADS)
+#    define BOOST_HAS_MPTASKS
+#  elif ( __dest_os == __mac_os_x )
+// We are doing a Carbon/Mach-O/MSL build which has pthreads, but only the
+// gettimeofday and no posix.
+#  define BOOST_HAS_GETTIMEOFDAY
+#  endif
+
+// The MP task implementation of Boost Threads aims to replace MP-unsafe
+// parts of the MSL, so we turn on threads unconditionally.
+#    define BOOST_HAS_THREADS
+
+// The remote call manager depends on this.
+#    define BOOST_BIND_ENABLE_PASCAL
+
+#  endif
+
+#endif
+
+
+