Merge services into a shared IOService in dart:io, and use a native port.

runtime/bin/socket.h

Index: runtime/bin/socket.h
diff --git a/runtime/bin/socket.h b/runtime/bin/socket.h
index db76f5852a5923723a66eb5186d0518070e92cd2..d6f9b0df1da0b0faeef278ab2f08022615210b9b 100644
--- a/runtime/bin/socket.h
+++ b/runtime/bin/socket.h
@@ -7,6 +7,7 @@
 
 #include "bin/builtin.h"
 #include "bin/utils.h"
+#include "bin/dartutils.h"
 
 #include "platform/globals.h"
 #include "platform/thread.h"
@@ -185,6 +186,10 @@ class Socket {
       int type,
       OSError** os_error);
 
+  static CObject* LookupRequest(const CObjectArray& request);
+  static CObject* ListInterfacesRequest(const CObjectArray& request);
+  static CObject* ReverseLookupRequest(const CObjectArray& request);
+
   static Dart_Port GetServicePort();
 
   static Dart_Handle SetSocketIdNativeField(Dart_Handle socket, intptr_t id);