Improve performance of table trees by around 3x

runtime/observatory/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/tracer.dart';
@@ skipping 103 matching lines @@
       case 'ProcessList':
         IOProcessListViewElement element =
             new Element.tag('io-process-list-view');
         element.list = object;
         return element;
       case 'Process':
         IOProcessViewElement element = new Element.tag('io-process-view');
         element.process = object;
         return element;
       case 'Profile':
-        IsolateProfileElement element = new Element.tag('isolate-profile');
+        CpuProfileElement element = new Element.tag('cpu-profile');
         element.profile = object;
         return element;
       case 'RandomAccessFileList':
         IORandomAccessFileListViewElement element =
             new Element.tag('io-random-access-file-list-view');
         element.list = object;
         return element;
       case 'RandomAccessFile':
         IORandomAccessFileViewElement element =
             new Element.tag('io-random-access-file-view');
@@ skipping 95 matching lines @@
 
   dynamic expander() {
     return expandEvent;
   }
 
   void expandEvent(bool exp, var done) {
     expand = exp;
     done();
   }
 }