Visualize heap fragmentation in Observatory.

runtime/bin/vmservice/client/lib/src/elements/service_view.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 service_object_view_element;
 
 import 'dart:html';
 import 'package:logging/logging.dart';
 import 'package:observatory/service.dart';
 import 'package:observatory/elements.dart';
@@ skipping 30 matching lines @@
         element.error = object;
         return element;
       case 'Field':
         FieldViewElement element = new Element.tag('field-view');
         element.field = object;
         return element;
       case 'Function':
         FunctionViewElement element = new Element.tag('function-view');
         element.function = object;
         return element;
+      case 'HeapMap':
+        HeapMapElement element = new Element.tag('heap-map');
+        element.fragmentation = object;
+        return element;
       case 'Array':
       case 'Bool':
       case 'Closure':
       case 'GrowableObjectArray':
       case 'Instance':
       case 'Smi':
       case 'String':
         InstanceViewElement element = new Element.tag('instance-view');
         element.instance = object;
         return element;
@@ skipping 32 matching lines @@
     var type = object.serviceType;
     var element = _constructElementForObject();
     if (element == null) {
       Logger.root.info('Unable to find a view element for \'${type}\'');
       return;
     }
     children.add(element);
     Logger.root.info('Viewing object of \'${type}\'');
   }
 }