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 from telemetry.web_perf import timeline_interaction_record as tir_module 9 10 class LoadingTrace(page_measurement.PageMeasurement): 11 def __init__(self, *args, **kwargs): 12 super(LoadingTrace, self).__init__(*args, **kwargs) 13 self._timeline_controller = timeline_controller.TimelineController() 14 15 @property 16 def results_are_the_same_on_every_page(self): 17 return False 18 19 def WillNavigateToPage(self, page, tab): 20 self._timeline_controller.Start(page, tab) 21 22 def MeasurePage(self, page, tab, results): 23 # In current telemetry tests, all tests wait for DocumentComplete state, 24 # but we need to wait for the load event. 25 tab.WaitForJavaScriptExpression('performance.timing.loadEventStart', 300) 26 27 # TODO(nduca): when crbug.com/168431 is fixed, modify the page sets to 28 # recognize loading as a toplevel action. 29 self._timeline_controller.Stop(tab) 30 31 loading.LoadingMetric().AddResults(tab, results) 32 timeline_metric = timeline.LoadTimesTimelineMetric() 33 renderer_thread = \ 34 self._timeline_controller.model.GetRendererThreadFromTabId(tab.id) 35 record = tir_module.TimelineInteractionRecord( 36 "loading_trace_interaction", 0, float('inf')) 37 timeline_metric.AddResults( 38 self._timeline_controller.model, 39 renderer_thread, 40 [record], 41 results) 42 43 def CleanUpAfterPage(self, _, tab): 44 self._timeline_controller.CleanUp(tab) 45
