Add ObjectPool tag for external labels. Use LoadExternalLabel for native calls...

runtime/observatory/lib/src/elements/objectpool_view.dart

 // Copyright (c) 2015, 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 objectpool_view;
 
 import 'dart:async';
 import 'observatory_element.dart';
 import 'package:observatory/service.dart';
 import 'package:polymer/polymer.dart';
 
 @CustomTag('objectpool-view')
 class ObjectPoolViewElement extends ObservatoryElement {
   @published ObjectPool pool;
   @published List annotatedEntries;
 
   ObjectPoolViewElement.created() : super.created();
 
   bool isServiceObject(o) => o is ServiceObject;
 
   void poolChanged(oldValue) {
-    annotateRawEntries();
+    annotateExternalLabels();
   }
 
-  Future annotateRawEntries() {
+  Future annotateExternalLabels() {
     var tasks = pool.entries.map((entry) {
-     if (entry is int) {
-       var addr = entry.toRadixString(16);
+     if (entry is String) {
+       var addr = entry.substring(2);
        return pool.isolate.getObjectByAddress(addr).then((result) {
          return result is ServiceObject ? result : null;
        });
      } else {
        return new Future.value(null);
      }
     });
 
     return Future.wait(tasks).then((results) => annotatedEntries = results);
   }
 
   Future refresh() {
-    return pool.reload().then((_) => annotateRawEntries());
+    return pool.reload().then((_) => annotateExternalLabels());
   }
 }