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# Copyright 2013 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
from metrics import loading
from metrics import timeline
from telemetry.core import util
from telemetry.page import page_measurement
class LoadingTrace(page_measurement.PageMeasurement):
def __init__(self, *args, **kwargs):
super(LoadingTrace, self).__init__(*args, **kwargs)
self._timeline_metric = timeline.TimelineMetric(timeline.TRACING_MODE)
@property
def results_are_the_same_on_every_page(self):
return False
def WillNavigateToPage(self, page, tab):
self._timeline_metric.Start(page, tab)
def MeasurePage(self, page, tab, results):
# In current telemetry tests, all tests wait for DocumentComplete state,
# but we need to wait for the load event.
def IsLoaded():
return bool(tab.EvaluateJavaScript('performance.timing.loadEventStart'))
util.WaitFor(IsLoaded, 300)
# TODO(nduca): when crbug.com/168431 is fixed, modify the page sets to
# recognize loading as a toplevel action.
self._timeline_metric.Stop(page, tab)
loading.LoadingMetric().AddResults(tab, results)
self._timeline_metric.AddResults(tab, results)
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