| # Copyright 2017 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. |
| |
| """The tab switching measurement. |
| |
| This measurement record the MPArch.RWH_TabSwitchPaintDuration histogram |
| of each tab swithcing. |
| """ |
| |
| from telemetry.page import legacy_page_test |
| from telemetry.value import histogram |
| from telemetry.value import histogram_util |
| |
| from contrib.cros_benchmarks import cros_utils |
| |
| |
| class CrosTabSwitchingMeasurement(legacy_page_test.LegacyPageTest): |
| """Measures tab switching performance.""" |
| |
| def __init__(self): |
| super(CrosTabSwitchingMeasurement, self).__init__() |
| self._first_histogram = None |
| |
| def CustomizeBrowserOptions(self, options): |
| """Adding necessary browser flag to collect histogram.""" |
| options.AppendExtraBrowserArgs(['--enable-stats-collection-bindings']) |
| |
| def DidNavigateToPage(self, page, tab): |
| """Record the starting histogram.""" |
| self._first_histogram = cros_utils.GetTabSwitchHistogramRetry(tab.browser) |
| |
| def ValidateAndMeasurePage(self, page, tab, results): |
| """Record the ending histogram for the tab switching metric.""" |
| last_histogram = cros_utils.GetTabSwitchHistogramRetry(tab.browser) |
| total_diff_histogram = histogram_util.SubtractHistogram( |
| last_histogram, self._first_histogram) |
| |
| display_name = 'MPArch_RWH_TabSwitchPaintDuration' |
| results.AddSummaryValue( |
| histogram.HistogramValue( |
| None, display_name, 'ms', |
| raw_value_json=total_diff_histogram, |
| important=False)) |
