[mojo-edk] Add support for transferring mach ports.

mojo/edk/system/BUILD.gn

 # Copyright 2014 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.
 
 import("//testing/test.gni")
 import("../../../mojo/public/tools/bindings/mojom.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
@@ skipping 87 matching lines @@
     "//base",
     "//base/third_party/dynamic_annotations",
     "//crypto",
   ]
 
   if (is_win) {
     cflags = [ "/wd4324" ]  # Structure was padded due to __declspec(align()),
                             # which is uninteresting.
   }
 
+  if (is_mac && !is_ios) {
+    sources += [
+      "mach_port_relay.cc",
+      "mach_port_relay.h",
+    ]
+  }
+
   allow_circular_includes_from = [ "//mojo/edk/embedder" ]
 }
 
 group("tests") {
   testonly = true
   deps = [
     ":mojo_message_pipe_perftests",
     ":mojo_system_unittests",
   ]
 }
@@ skipping 66 matching lines @@
     ":test_utils",
     "//base",
     "//base/test:test_support",
     "//mojo/edk/system",
     "//mojo/edk/test:run_all_perftests",
     "//mojo/edk/test:test_support",
     "//mojo/public/cpp/environment:standalone",
     "//testing/gtest",
   ]
 }