src/tools/perf/measurements/loading_trace.py

   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.
   4 from measurements import timeline_controller
   5 from metrics import loading
   6 from metrics import timeline
   7 from telemetry.page import page_measurement
   8
   9 class LoadingTrace(page_measurement.PageMeasurement):
  10   def __init__(self, *args, **kwargs):
  11     super(LoadingTrace, self).__init__(*args, **kwargs)
  12     self._timeline_controller = timeline_controller.TimelineController()
  13
  14   @property
  15   def results_are_the_same_on_every_page(self):
  16     return False
  17
  18   def WillNavigateToPage(self, page, tab):
  19     self._timeline_controller.Start(page, tab)
  20
  21   def MeasurePage(self, page, tab, results):
  22     # In current telemetry tests, all tests wait for DocumentComplete state,
  23     # but we need to wait for the load event.
  24     tab.WaitForJavaScriptExpression('performance.timing.loadEventStart', 300)
  25
  26     # TODO(nduca): when crbug.com/168431 is fixed, modify the page sets to
  27     # recognize loading as a toplevel action.
  28     self._timeline_controller.Stop(tab)
  29
  30     loading.LoadingMetric().AddResults(tab, results)
  31     timeline_metric = timeline.LoadTimesTimelineMetric(
  32       self._timeline_controller.model,
  33       self._timeline_controller.renderer_process,
  34       self._timeline_controller.action_ranges)
  35     timeline_metric.AddResults(tab, results)
  36
  37   def CleanUpAfterPage(self, _, tab):
  38     self._timeline_controller.CleanUp(tab)