Add callers and callees to profiler output

runtime/bin/vmservice/client/lib/src/observatory_elements/table_tree.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 table_tree_element;
+
+import 'dart:html';
+import 'observatory_element.dart';
+import 'package:observatory/observatory.dart';
+import 'package:polymer/polymer.dart';
+
+
+@CustomTag('table-tree')
+class TableTreeElement extends ObservatoryElement {
+  TableTreeElement.created() : super.created();
+  @published TableTree tree;
+
+  String padding(TableTreeRow row) {
+    return 'padding-left: ${row.depth * 16}px;';
+  }
+
+  String coloring(TableTreeRow row) {
+    const colors = const ['active', 'success', 'warning', 'danger', 'info'];
+    var index = row.depth % colors.length;
+    return colors[index];
+  }
+
+  void toggleExpanded(Event e, var detail, Element target) {
+    TableElement table = shadowRoot.querySelector('#_table');
+    var index = table.tBodies[0].children.indexOf(target.parent) - 1;
+    assert(index >= 0);
+    assert(index < tree.rows.length);
+    tree.toggle(index);
+  }
+}