Converted Observatory icdata-view element

runtime/observatory/lib/src/elements/object_common.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.
 
 import 'dart:html';
 import 'dart:async';
 import 'package:observatory/models.dart' as M;
 import 'package:observatory/src/elements/class_ref.dart';
 import 'package:observatory/src/elements/helpers/rendering_scheduler.dart';
 import 'package:observatory/src/elements/helpers/tag.dart';
@@ skipping 93 matching lines @@
                 ..children = [
                   new ClassRefElement(_isolate, _object.clazz, queue: _r.queue)
                 ]
             ],
           new DivElement()..classes = const ['memberItem']
             ..title = 'Space for this object in memory'
             ..children = [
               new DivElement()..classes = const ['memberName']
                 ..text = 'Shallow size ',
               new DivElement()..classes = const ['memberValue']
-                ..text = Utils.formatSize(_object.size)
+                ..text = Utils.formatSize(_object.size ?? 0)
             ],
           new DivElement()..classes = const ['memberItem']
             ..title = 'Space reachable from this object, '
                       'excluding class references'
             ..children = [
               new DivElement()..classes = const ['memberName']
                 ..text = 'Reachable size ',
               new DivElement()..classes = const ['memberValue']
                 ..children = _createReachableSizeValue()
             ],
@@ skipping 80 matching lines @@
     button.onClick.listen((_) async {
         button.disabled = true;
         _loadingRetainedBytes = true;
         _retainedSize = await _retainedSizes.get(_isolate, _object.id);
         _r.dirty();
       });
     content.add(button);
     return content;
   }
 }