Using multi-tab story in TabSwitching Benchmark

tools/perf/measurements/tab_switching.py

 # 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.
@@ skipping 103 matching lines @@
     results.AddSummaryValue(
         histogram.HistogramValue(None, display_name, 'ms',
                                  raw_value_json=total_diff_histogram,
                                  important=False))
 
     keychain_metric.KeychainMetric().AddResults(tab, results)
 
   def DidRunPage(self, platform):
     del platform  # unused
     self._power_metric.Close()
+
+class TabSwitching2(legacy_page_test.LegacyPageTest):
+  # Amount of time to measure, in seconds.
+  SAMPLE_TIME = 30
+
+  def __init__(self):
+    super(TabSwitching2, self).__init__()
+    self._power_metric = None
+    self._first_histogram = None
+
+  def CustomizeBrowserOptions(self, options):
+    keychain_metric.KeychainMetric.CustomizeBrowserOptions(options)
+
+    options.AppendExtraBrowserArgs(['--enable-stats-collection-bindings'])
+
+    # Enable background networking so we can test its impact on power usage.
+    options.disable_background_networking = False
+    power.PowerMetric.CustomizeBrowserOptions(options)
+
+  def WillStartBrowser(self, platform):
+    self._power_metric = power.PowerMetric(platform, TabSwitching.SAMPLE_TIME)
+
+  @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."""
+    if tab.browser.platform.CanMonitorPower():
+      self._power_metric.Start(page, tab)
+      time.sleep(TabSwitching.SAMPLE_TIME)
+      self._power_metric.Stop(page, tab)
+      self._power_metric.AddResults(tab, results,)
+
+    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)
+
+  def DidRunPage(self, platform):
+    del platform  # unused
+    self._power_metric.Close()

[nednguyen, 2017/03/21 14:46:12]

Can you remove the legacy power_metric? The old power metric code is rotted &
its data are not trust-worthy, so our team is trying to get rid of it.

[vovoy, 2017/03/23 09:37:49]

Done.

+