Add a VM page to the observatory.

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"
@@ skipping 22 matching lines @@
   static void RegisterIsolateEmbedderCallback(
       const char* name,
       Dart_ServiceRequestCallback callback,
       void* user_data);
 
   static void RegisterRootEmbedderCallback(
       const char* name,
       Dart_ServiceRequestCallback callback,
       void* user_data);
 
+  static bool IsServiceIsolate(Isolate* isolate) {
+    return isolate == service_isolate_;
+  }
+
  private:
   static void EmbedderHandleMessage(EmbedderServiceHandler* handler,
                                     JSONStream* js);
   static EmbedderServiceHandler* FindIsolateEmbedderHandler(const char* name);
   static EmbedderServiceHandler* isolate_service_handler_head_;
   static EmbedderServiceHandler* FindRootEmbedderHandler(const char* name);
   static EmbedderServiceHandler* root_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_