<!DOCTYPE html>
<!--
Copyright (c) 2014 The Chromium Authors. All rights reserved.
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->

<link rel="import" href="/tracing/base/guid.html">
<link rel="import" href="/tracing/base/utils.html">

<script>
'use strict';
tr.exportTo('tr.b', function() {
  class Mark {
    constructor(groupName, functionName, opt_timestamp) {
      if (tr.isHeadless) return;

      this.groupName_ = groupName;
      this.functionName_