Tab Switching Benchmark for ChromeOS

tools/perf/contrib/cros_benchmarks/tab_switching_measure.py

Index: tools/perf/contrib/cros_benchmarks/tab_switching_measure.py
diff --git a/tools/perf/contrib/cros_benchmarks/tab_switching_measure.py b/tools/perf/contrib/cros_benchmarks/tab_switching_measure.py
new file mode 100644
index 0000000000000000000000000000000000000000..9e1fd9135193dd68174082070fc7e76565136e2a
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+++ b/tools/perf/contrib/cros_benchmarks/tab_switching_measure.py
@@ -0,0 +1,49 @@
+# 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
+
+
+class TabSwitchingMeasurement(legacy_page_test.LegacyPageTest):
+  def __init__(self):
+    super(TabSwitchingMeasurement, self).__init__()
+    self._first_histogram = None
+
+  def CustomizeBrowserOptions(self, 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"""
+    # the browser shall focus on last tab now
+    last_tab = tab.browser.tabs[-1]
+    self._first_histogram = self._GetTabSwitchHistogram(last_tab)
+
+  def ValidateAndMeasurePage(self, page, tab, results):
+    """record the ending histogram for the tab switching metric."""
+    # the browser shall focus on last tab now
+    last_tab = tab.browser.tabs[-1]
+    last_histogram = self._GetTabSwitchHistogram(last_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))