Add mach ports support to the Mojo shell.

mojo/mojo_shell.gyp

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'targets': [{
     'target_name': 'mojo_shell_lib',
     'type': 'static_library',
     'sources': [
       'services/catalog/builder.cc',
@@ skipping 123 matching lines @@
           'shell/runner/host/linux_sandbox.cc',
           'shell/runner/host/linux_sandbox.h',
         ],
         'dependencies': [
           '<(DEPTH)/sandbox/sandbox.gyp:sandbox',
           '<(DEPTH)/sandbox/sandbox.gyp:sandbox_services',
           '<(DEPTH)/sandbox/sandbox.gyp:seccomp_bpf',
           '<(DEPTH)/sandbox/sandbox.gyp:seccomp_bpf_helpers',
         ],
       }],
+      ['OS=="mac"', {
+        'sources': [
+          'shell/runner/host/mach_broker.cc',
+          'shell/runner/host/mach_broker.h',
+        ],
+      }],
     ],
   }],
 }