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

mojo/edk/system/core.cc

Index: mojo/edk/system/core.cc
diff --git a/mojo/edk/system/core.cc b/mojo/edk/system/core.cc
index d43630711c5bfa9cf561668af5104c2ef0731803..49cb24234a54e5ec1710bb930aabef9a4a1ceb18 100644
--- a/mojo/edk/system/core.cc
+++ b/mojo/edk/system/core.cc
@@ -99,6 +99,12 @@ void Core::InitChild(ScopedPlatformHandle platform_handle) {
   GetNodeController()->ConnectToParent(std::move(platform_handle));
 }
 
+void Core::SetMachPortProvider(base::PortProvider* port_provider) {
+#if defined(OS_MACOSX) && !defined(OS_IOS)
+  GetNodeController()->CreateMachPortRelay(port_provider);
+#endif
+}
+
 MojoHandle Core::AddDispatcher(scoped_refptr<Dispatcher> dispatcher) {
   base::AutoLock lock(handles_lock_);
   return handles_.AddDispatcher(dispatcher);