Allow for embedder provided service request handlers

runtime/vm/service.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_H_
 #define VM_SERVICE_H_
 
 #include "include/dart_api.h"
 
 #include "vm/allocation.h"
 
 namespace dart {
 
+class EmbedderServiceHandler;
 class Instance;
 class Isolate;
+class JSONStream;
 class RawInstance;
 
 class Service : public AllStatic {
  public:
   // Handles a message which is not directed to an isolate.
   static void HandleRootMessage(const Instance& message);
 
   // Handles a message which is directed to a particular isolate.
   static void HandleIsolateMessage(Isolate* isolate, const Instance& message);
 
   static Isolate* GetServiceIsolate(void* callback_data);
   static bool SendIsolateStartupMessage();
   static bool SendIsolateShutdownMessage();
+  static bool IsRunning();
+
+  static void RegisterEmbedderCallback(const char* name,
+                                       Dart_ServiceRequestCallback callback,
+                                       void* user_data);
+
  private:
-  static bool IsRunning();
+  static void EmbedderHandleIsolateMessage(EmbedderServiceHandler* handler,
+                                           JSONStream* js);
+  static EmbedderServiceHandler* FindEmbedderHandler(const char* name);
+  static EmbedderServiceHandler* service_handler_head_;
   static Isolate* service_isolate_;
   static Dart_LibraryTagHandler default_handler_;
   static Dart_Port port_;
   static Dart_Handle GetSource(const char* name);
   static Dart_Handle LibraryTagHandler(Dart_LibraryTag tag, Dart_Handle library,
                                        Dart_Handle url);
 };
 
 }  // namespace dart
 
 #endif  // VM_SERVICE_H_