Allow root level requests in the vm service.

runtime/bin/vmservice/vmservice.dart

 // 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.
 
 library vmservice;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:isolate';
 import 'dart:typed_data';
@@ skipping 65 matching lines @@
   }
 
   Future<String> route(Message message) {
     if (message.completed) {
       return message.response;
     }
     if ((message.path.length == 1) && (message.path[0] == 'clients')) {
       _clientCollection(message);
       return message.response;
     }
-    return runningIsolates.route(message);
+    if (message.path[0] == 'isolates') {
+      return runningIsolates.route(message);
+    }
+
+    return message.sendToVM();
   }
 }
-
-void sendServiceMessage(SendPort sp, Object m)
-    native "VMService_SendServiceMessage";