tools/perf/measurements/polymer_load.py

   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
   5 from telemetry.page import page
   6 from telemetry.page import page_test
   7 from telemetry.value import scalar
   8
   9
  10 class PageForPolymerLoad(page.Page):
  11
  12   def __init__(self, url, page_set, ready_event='polymer-ready'):
  13     super(PageForPolymerLoad, self).__init__(
  14       url=url,
  15       page_set=page_set)
  16     self.script_to_evaluate_on_commit = '''
  17       document.addEventListener("%s", function() {
  18         var unused = document.body.offsetHeight;
  19         window.__polymer_ready_time = performance.now();
  20         setTimeout(function() {
  21           window.__polymer_ready = true;
  22         }, 1000);
  23       })
  24     ''' % ready_event
  25
  26   def RunNavigateSteps(self, action_runner):
  27    super(PageForPolymerLoad, self).RunNavigateSteps(action_runner)
  28    action_runner.WaitForJavaScriptCondition('window.__polymer_ready')
  29
  30
  31 class PolymerLoadMeasurement(page_test.PageTest):
  32   def __init__(self):
  33     super(PolymerLoadMeasurement, self).__init__()
  34
  35   def ValidateAndMeasurePage(self, _, tab, results):
  36     result = int(tab.EvaluateJavaScript('__polymer_ready_time'))
  37     results.AddValue(scalar.ScalarValue(
  38         results.current_page, 'Total', 'ms', result))