35 lines
1.2 KiB
Python
35 lines
1.2 KiB
Python
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# Copyright 2013 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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from metrics import loading
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from metrics import timeline
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from telemetry.core import util
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from telemetry.page import page_measurement
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class LoadingTrace(page_measurement.PageMeasurement):
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def __init__(self, *args, **kwargs):
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super(LoadingTrace, self).__init__(*args, **kwargs)
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self._metrics = None
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@property
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def results_are_the_same_on_every_page(self):
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return False
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def WillNavigateToPage(self, page, tab):
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self._metrics = timeline.TimelineMetrics(timeline.TRACING_MODE)
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self._metrics.Start(tab)
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def MeasurePage(self, page, tab, results):
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# In current telemetry tests, all tests wait for DocumentComplete state,
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# but we need to wait for the load event.
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def IsLoaded():
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return bool(tab.EvaluateJavaScript('performance.timing.loadEventStart'))
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util.WaitFor(IsLoaded, 300)
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# TODO(nduca): when crbug.com/168431 is fixed, modify the page sets to
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# recognize loading as a toplevel action.
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self._metrics.Stop(tab)
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loading.LoadingMetric().AddResults(tab, results)
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self._metrics.AddResults(results)
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