Fix Dartium Observatory

runtime/bin/vmservice/client/lib/src/app/vm.dart

 // Copyright (c) 2014, 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.
 
 part of app;
 
 abstract class VM extends Observable {
   @observable ObservatoryApplication get app => _app;
   ObservatoryApplication _app;
 
@@ skipping 75 matching lines @@
 
   Future<String> fetchString(String path) {
     Logger.root.info('Fetching $path from $address');
     return HttpRequest.getString(address + path);
   }
 }
 
 class DartiumVM extends VM {
   final Map _outstandingRequests = new Map();
   int _requestSerial = 0;
-  PostMessageRequestManager() {
+
+  DartiumVM() {
     window.onMessage.listen(_messageHandler);
+    print('Connected to DartiumVM');
   }
 
   void _messageHandler(msg) {
     var id = msg.data['id'];
     var name = msg.data['name'];
     var data = msg.data['data'];
     if (name != 'observatoryData') {
       return;
     }
     var completer = _outstandingRequests[id];
     assert(completer != null);
     _outstandingRequests.remove(id);
     completer.complete(data);
   }
 
   Future<String> fetchString(String path) {
     var idString = '$_requestSerial';
     Map message = {};
     message['id'] = idString;
     message['method'] = 'observatoryQuery';
-    message['query'] = path;
+    message['query'] = '/$path';
     _requestSerial++;
     var completer = new Completer();
     _outstandingRequests[idString] = completer;
     window.parent.postMessage(JSON.encode(message), '*');
     return completer.future;
   }
 }