| # 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. |
| """ |
| |
| from metrics import histogram |
| from telemetry.core import util |
| from telemetry.page import page_measurement |
| from telemetry.page import page_runner |
| |
| # TODO: Revisit this test once multitab support is finalized. |
| |
| class TabSwitching(page_measurement.PageMeasurement): |
| def CustomizeBrowserOptions(self, options): |
| options.AppendExtraBrowserArg('--enable-stats-collection-bindings') |
| options.AppendExtraBrowserArg('--dom-automation') |
| |
| def CanRunForPage(self, page): |
| return not page.page_set.pages.index(page) |
| |
| def DidNavigateToPage(self, page, tab): |
| for i in xrange(1, len(page.page_set.pages)): |
| t = tab.browser.tabs.New() |
| |
| page_state = page_runner.PageState() |
| page_state.PreparePage(page.page_set.pages[i], t) |
| |
| def MeasurePage(self, _, tab, results): |
| """Although this is called MeasurePage, we're actually using this function |
| to cycle through each tab that was opened via DidNavigateToPage and |
| thenrecord a single histogram for the tab switching metric. |
| """ |
| histogram_name = 'MPArch.RWH_TabSwitchPaintDuration' |
| histogram_type = histogram.BROWSER_HISTOGRAM |
| first_histogram = histogram.GetHistogramData(histogram_type, |
| histogram_name, tab) |
| prev_histogram = first_histogram |
| |
| for i in xrange(len(tab.browser.tabs)): |
| t = tab.browser.tabs[i] |
| t.Activate() |
| def _IsDone(): |
| cur_histogram = histogram.GetHistogramData( |
| histogram_type,histogram_name, tab) |
| diff_histogram = histogram.SubtractHistogram( |
| cur_histogram, prev_histogram) |
| return diff_histogram |
| util.WaitFor(_IsDone, 30) |
| prev_histogram = histogram.GetHistogramData( |
| histogram_type, histogram_name, tab) |
| |
| last_histogram = histogram.GetHistogramData( |
| histogram_type, histogram_name, tab) |
| diff_histogram = histogram.SubtractHistogram(last_histogram, |
| first_histogram) |
| |
| results.AddSummary(histogram_name, '', diff_histogram, |
| data_type='unimportant-histogram') |