1 # Copyright 2013 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.
5 from telemetry.page import page_measurement
7 class NavigateMeasurement(page_measurement.PageMeasurement):
8 """ Measures time between navigation start and the end of the navigate_steps
10 For pages where the 'load' event isn't a good measurement point, this
11 measurement allows a page_set to have its loading sequence listed by
12 way of navigate_steps, with a navigation_time result measured
16 super(NavigateMeasurement, self).__init__()
17 self._navigate_time = None
19 def DidNavigateToPage(self, page, tab):
20 self._navigate_time = int(tab.EvaluateJavaScript('performance.now()'))
22 def MeasurePage(self, page, tab, results):
23 results.Add('navigate_time', 'ms', self._navigate_time)