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

mojo/edk/system/core.h

Index: mojo/edk/system/core.h
diff --git a/mojo/edk/system/core.h b/mojo/edk/system/core.h
index 65b6933a8bf6130ab5134bf8de7cf53f0f74745d..9c284602f948010bddb09ffee213701a556d0485 100644
--- a/mojo/edk/system/core.h
+++ b/mojo/edk/system/core.h
@@ -27,6 +27,10 @@
 #include "mojo/public/c/system/types.h"
 #include "mojo/public/cpp/system/message_pipe.h"
 
+namespace base {
+class PortProvider;
+}
+
 namespace mojo {
 namespace edk {
 
@@ -67,6 +71,9 @@ class MOJO_SYSTEM_IMPL_EXPORT Core {
   // associated with |token|.
   ScopedMessagePipeHandle CreateChildMessagePipe(const std::string& token);
 
+  // Sets the mach port provider for this process.
+  void SetMachPortProviderIfNeeded(base::PortProvider* port_provider);
+
   MojoHandle AddDispatcher(scoped_refptr<Dispatcher> dispatcher);
 
   // Adds new dispatchers for non-message-pipe handles received in a message.