65 lines
2.5 KiB
Python
65 lines
2.5 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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"""The tab switching measurement.
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This measurement opens pages in different tabs. After all the tabs have opened,
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it cycles through each tab in sequence, and records a histogram of the time
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between when a tab was first requested to be shown, and when it was painted.
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"""
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from metrics import histogram_util
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from telemetry.core import util
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from telemetry.page import page_measurement
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from telemetry.page import page_runner
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# TODO: Revisit this test once multitab support is finalized.
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class TabSwitching(page_measurement.PageMeasurement):
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def CustomizeBrowserOptions(self, options):
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options.AppendExtraBrowserArg('--enable-stats-collection-bindings')
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options.AppendExtraBrowserArg('--dom-automation')
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def CanRunForPage(self, page):
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return not page.page_set.pages.index(page)
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def DidNavigateToPage(self, page, tab):
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for i in xrange(1, len(page.page_set.pages)):
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t = tab.browser.tabs.New()
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page_state = page_runner.PageState()
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page_state.PreparePage(page.page_set.pages[i], t)
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def MeasurePage(self, _, tab, results):
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"""Although this is called MeasurePage, we're actually using this function
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to cycle through each tab that was opened via DidNavigateToPage and
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thenrecord a single histogram for the tab switching metric.
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"""
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histogram_name = 'MPArch.RWH_TabSwitchPaintDuration'
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histogram_type = 'getBrowserHistogram'
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first_histogram = histogram_util.GetHistogramFromDomAutomation(
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histogram_type, histogram_name, tab)
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prev_histogram = first_histogram
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for i in xrange(len(tab.browser.tabs)):
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t = tab.browser.tabs[i]
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t.Activate()
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def _IsDone():
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cur_histogram = histogram_util.GetHistogramFromDomAutomation(
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histogram_type, histogram_name, tab)
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diff_histogram = histogram_util.SubtractHistogram(
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cur_histogram, prev_histogram)
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return diff_histogram
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util.WaitFor(_IsDone, 30)
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prev_histogram = histogram_util.GetHistogramFromDomAutomation(
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histogram_type, histogram_name, tab)
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last_histogram = histogram_util.GetHistogramFromDomAutomation(
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histogram_type, histogram_name, tab)
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diff_histogram = histogram_util.SubtractHistogram(last_histogram,
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first_histogram)
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results.AddSummary(histogram_name, '', diff_histogram,
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data_type='unimportant-histogram')
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