| # 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. |
| |
| """The tab switching measurement. |
| |
| This measurement opens pages in different tabs. After all the tabs have opened, |
| it cycles through each tab in sequence, and records a histogram of the time |
| between when a tab was first requested to be shown, and when it was painted. |
| Power usage is also measured. |
| """ |
| |
| from telemetry.page import legacy_page_test |
| from telemetry.value import histogram |
| from telemetry.value import histogram_util |
| |
| from metrics import keychain_metric |
| |
| |
| class TabSwitching(legacy_page_test.LegacyPageTest): |
| def __init__(self): |
| super(TabSwitching, self).__init__() |
| self._first_histogram = None |
| |
| def CustomizeBrowserOptions(self, options): |
| keychain_metric.KeychainMetric.CustomizeBrowserOptions(options) |
| |
| options.AppendExtraBrowserArgs(['--enable-stats-collection-bindings']) |
| |
| @classmethod |
| def _GetTabSwitchHistogram(cls, tab_to_switch): |
| histogram_name = 'MPArch.RWH_TabSwitchPaintDuration' |
| histogram_type = histogram_util.BROWSER_HISTOGRAM |
| return histogram_util.GetHistogram( |
| histogram_type, histogram_name, tab_to_switch) |
| |
| def DidNavigateToPage(self, page, tab): |
| """record the starting histogram""" |
| self._first_histogram = self._GetTabSwitchHistogram(tab) |
| |
| def ValidateAndMeasurePage(self, page, tab, results): |
| """record the ending histogram for the tab switching metric.""" |
| last_histogram = self._GetTabSwitchHistogram(tab) |
| 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)) |
| |
| keychain_metric.KeychainMetric().AddResults(tab, results) |
