Do not register service isolate descendants with service

runtime/vm/service_isolate.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_SERVICE_ISOLATE_H_
 #define VM_SERVICE_ISOLATE_H_
 
 #include "include/dart_api.h"
 
 #include "vm/allocation.h"
 #include "vm/os_thread.h"
 
 namespace dart {
 
 class ServiceIsolate : public AllStatic {
  public:
   static const char* kName;
   static bool NameEquals(const char* name);
 
   static bool Exists();
   static bool IsRunning();
   static bool IsServiceIsolate(Isolate* isolate);
+  static bool IsServiceIsolateDescendant(Isolate* isolate);
   static Dart_Port Port();
 
   static Dart_Port WaitForLoadPort();
   static Dart_Port LoadPort();
 
   static void Run();
   static bool SendIsolateStartupMessage();
   static bool SendIsolateShutdownMessage();
   static void SendServiceExitMessage();
   static void Shutdown();
@@ skipping 16 matching lines @@
 
   static Dart_IsolateCreateCallback create_callback_;
   static uint8_t* exit_message_;
   static intptr_t exit_message_length_;
   static Monitor* monitor_;
   static bool initializing_;
   static bool shutting_down_;
   static Isolate* isolate_;
   static Dart_Port port_;
   static Dart_Port load_port_;
+  static Dart_Port origin_;
 
   friend class Dart;
   friend class RunServiceTask;
   friend class ServiceIsolateNatives;
 };
 
 }  // namespace dart
 
 #endif  // VM_SERVICE_ISOLATE_H_