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 metrics import loading 5 from metrics import timeline 6 from telemetry.core import util 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._metrics = None 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._metrics = timeline.TimelineMetrics(timeline.TRACING_MODE) 20 self._metrics.Start(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 def IsLoaded(): 26 return bool(tab.EvaluateJavaScript('performance.timing.loadEventStart')) 27 util.WaitFor(IsLoaded, 300) 28 29 # TODO(nduca): when crbug.com/168431 is fixed, modify the page sets to 30 # recognize loading as a toplevel action. 31 self._metrics.Stop(tab) 32 33 loading.LoadingMetric().AddResults(tab, results) 34 self._metrics.AddResults(results) 35
