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| 1 # Copyright 2017 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 |
| 5 """The tab switching measurement. |
| 6 |
| 7 This measurement record the MPArch.RWH_TabSwitchPaintDuration histogram |
| 8 of each tab swithcing |
| 9 """ |
| 10 |
| 11 from telemetry.page import legacy_page_test |
| 12 from telemetry.value import histogram |
| 13 from telemetry.value import histogram_util |
| 14 |
| 15 |
| 16 class TabSwitchingMeasurement(legacy_page_test.LegacyPageTest): |
| 17 def __init__(self): |
| 18 super(TabSwitchingMeasurement, self).__init__() |
| 19 self._first_histogram = None |
| 20 |
| 21 def CustomizeBrowserOptions(self, options): |
| 22 options.AppendExtraBrowserArgs(['--enable-stats-collection-bindings']) |
| 23 |
| 24 @classmethod |
| 25 def _GetTabSwitchHistogram(cls, tab_to_switch): |
| 26 histogram_name = 'MPArch.RWH_TabSwitchPaintDuration' |
| 27 histogram_type = histogram_util.BROWSER_HISTOGRAM |
| 28 return histogram_util.GetHistogram( |
| 29 histogram_type, histogram_name, tab_to_switch) |
| 30 |
| 31 def DidNavigateToPage(self, page, tab): |
| 32 """record the starting histogram""" |
| 33 # the browser shall focus on last tab now |
| 34 last_tab = tab.browser.tabs[-1] |
| 35 self._first_histogram = self._GetTabSwitchHistogram(last_tab) |
| 36 |
| 37 def ValidateAndMeasurePage(self, page, tab, results): |
| 38 """record the ending histogram for the tab switching metric.""" |
| 39 # the browser shall focus on last tab now |
| 40 last_tab = tab.browser.tabs[-1] |
| 41 last_histogram = self._GetTabSwitchHistogram(last_tab) |
| 42 total_diff_histogram = histogram_util.SubtractHistogram(last_histogram, |
| 43 self._first_histogram) |
| 44 |
| 45 display_name = 'MPArch_RWH_TabSwitchPaintDuration' |
| 46 results.AddSummaryValue( |
| 47 histogram.HistogramValue(None, display_name, 'ms', |
| 48 raw_value_json=total_diff_histogram, |
| 49 important=False)) |
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