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_test
   8 from telemetry.web_perf import timeline_interaction_record as tir_module
   9
  10 class LoadingTrace(page_test.PageTest):
  11   def __init__(self, *args, **kwargs):
  12     super(LoadingTrace, self).__init__(*args, **kwargs)
  13     self._timeline_controller = timeline_controller.TimelineController()
  14
  15   def WillNavigateToPage(self, page, tab):
  16     self._timeline_controller.SetUp(page, tab)
  17     self._timeline_controller.Start(tab)
  18
  19   def ValidateAndMeasurePage(self, page, tab, results):
  20     # In current telemetry tests, all tests wait for DocumentComplete state,
  21     # but we need to wait for the load event.
  22     tab.WaitForJavaScriptExpression('performance.timing.loadEventStart', 300)
  23
  24     # TODO(nduca): when crbug.com/168431 is fixed, modify the page sets to
  25     # recognize loading as a toplevel action.
  26     self._timeline_controller.Stop(tab)
  27
  28     loading.LoadingMetric().AddResults(tab, results)
  29     timeline_metric = timeline.LoadTimesTimelineMetric()
  30     renderer_thread = \
  31         self._timeline_controller.model.GetRendererThreadFromTabId(tab.id)
  32     record = tir_module.TimelineInteractionRecord(
  33       "loading_trace_interaction", 0, float('inf'))
  34     timeline_metric.AddResults(
  35       self._timeline_controller.model,
  36       renderer_thread,
  37       [record],
  38       results)
  39
  40   def CleanUpAfterPage(self, _, tab):
  41     self._timeline_controller.CleanUp(tab)