Allow Dart code to register service protocol 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_tools_api.h"
 
 #include "vm/allocation.h"
@@ skipping 126 matching lines @@
   }
 
  private:
   static void InvokeMethod(Isolate* isolate, const Array& message);
 
   static void EmbedderHandleMessage(EmbedderServiceHandler* handler,
                                     JSONStream* js);
 
   static EmbedderServiceHandler* FindIsolateEmbedderHandler(const char* name);
   static EmbedderServiceHandler* FindRootEmbedderHandler(const char* name);
-
+  static bool ExtensionHandlerExists(const String& name);
+  static bool InvokeExtensionHandler(const String& name,
+                                     const Array& parameter_keys,
+                                     const Array& parameter_values,
+                                     const Instance& reply_port,
+                                     const Instance& id);
   static void SendEvent(const char* stream_id,
                         const char* event_type,
                         const Object& eventMessage);
 
   // Does not take ownership of 'data'.
   static void SendEventWithData(const char* stream_id,
                                 const char* event_type,
                                 const String& meta,
                                 const uint8_t* data,
                                 intptr_t size);
@@ skipping 10 matching lines @@
   static bool needs_isolate_events_;
   static bool needs_debug_events_;
   static bool needs_gc_events_;
   static bool needs_echo_events_;
   static bool needs_graph_events_;
 };
 
 }  // namespace dart
 
 #endif  // VM_SERVICE_H_