1# Copyright 2014 The Chromium Authors. All rights reserved.
2# Use of this source code is governed by a BSD-style license that can be
3# found in the LICENSE file.
4
5from telemetry.web_perf.metrics import single_event
6
7EVENT_NAME = 'FrameView::performLayout'
8METRIC_NAME = 'layout'
9
10class LayoutMetric(single_event._SingleEventMetric):
11  """Reports directly durations of FrameView::performLayout events.
12
13    layout: Durations of FrameView::performLayout events that were caused by and
14            start during user interaction.
15
16  Layout happens no more than once per frame, so per-frame-ness is implied.
17  """
18
19  def __init__(self):
20    super(LayoutMetric, self).__init__(EVENT_NAME, METRIC_NAME,
21        metric_description=('List of durations of layouts that were caused by '
22                            'and start during interactions'))
23