1<!DOCTYPE html>
2<!--
3Copyright (c) 2015 The Chromium Authors. All rights reserved.
4Use of this source code is governed by a BSD-style license that can be
5found in the LICENSE file.
6-->
7
8<link rel="import" href="/tracing/base/base.html">
9
10<script>
11'use strict';
12
13tr.exportTo('tr.ui.annotations', function() {
14  /**
15   * A base class for all annotation views.
16   * @constructor
17   */
18  function AnnotationView(viewport, annotation) {
19  }
20
21  AnnotationView.prototype = {
22    draw: function(ctx) {
23      throw new Error('Not implemented');
24    }
25  };
26
27  return {
28    AnnotationView: AnnotationView
29  };
30});
31</script>
32