Provide an API to dart:developer to control the web server hosting the Service Protocol

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"
 #include "vm/object_id_ring.h"
 #include "vm/os_thread.h"
 
 namespace dart {
 
+#define SERVICE_PROTOCOL_MAJOR_VERSION 3
+#define SERVICE_PROTOCOL_MINOR_VERSION 5
+
 class Array;
 class EmbedderServiceHandler;
 class Error;
 class GCEvent;
 class GrowableObjectArray;
 class Instance;
 class Isolate;
 class JSONStream;
 class Object;
 class RawInstance;
@@ skipping 186 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_