Misc Observatory tweaks.

runtime/observatory/lib/src/elements/class_tree.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.
 
 library class_tree_element;
 
 import 'dart:html';
 import 'dart:async';
 import 'package:observatory/models.dart' as M;
 import 'package:observatory/src/elements/class_ref.dart';
@@ skipping 76 matching lines @@
       navBar([
         new NavTopMenuElement(queue: _r.queue),
         new NavVMMenuElement(_vm, _events, queue: _r.queue),
         new NavIsolateMenuElement(_isolate, _events, queue: _r.queue),
         navMenu('class hierarchy'),
         new NavNotifyElement(_notifications, queue: _r.queue)
       ]),
       new DivElement()
         ..classes = ['content-centered']
         ..children = [
-          new HeadingElement.h1()..text = 'Class Hierarchy',
+          new HeadingElement.h1()
+            ..text = 'Class Hierarchy (${_subclasses.length})',
           new BRElement(),
           new HRElement(),
           _object == null
               ? (new HeadingElement.h2()..text = 'Loading...')
               : _createTree()
         ]
     ];
   }
 
   Element _createTree() {
@@ skipping 72 matching lines @@
             ])
         .toList();
     children.first.text = ' with ';
     return children;
   }
 
   Iterable<M.Class> _children(M.Class cls) {
     return _subclasses[cls.id];
   }
 }