Use VM tag in profile and add stack trace trie

runtime/bin/vmservice/client/lib/src/elements/sliding_checkbox.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 sliding_checkbox_element;
+
+import 'dart:html';
+import 'package:polymer/polymer.dart';
+
+@CustomTag('sliding-checkbox')
+class SlidingCheckboxElement extends PolymerElement {
+  SlidingCheckboxElement.created() : super.created();
+  @published bool checked;
+  @published String onText;
+  @published String offText;
+
+  void change(Event e, var details, Node target) {
+    CheckboxInputElement input = shadowRoot.querySelector('#slide-switch');
+    checked = input.checked;
+  }
+}