NOT FOR SUBMIT: use counters for jdm@

tools/perf/measurements/usecounter.py

+# Copyright 2016 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.
+
+from telemetry.page import legacy_page_test
+
+from metrics import usecounter
+
+class UseCounter(legacy_page_test.LegacyPageTest):
+
+  def __init__(self, needs_browser_restart_after_each_page=False):
+      super(UseCounter, self).__init__(needs_browser_restart_after_each_page)
+      self._metric = usecounter.UseCounterMetric()
+
+  @classmethod
+  def CustomizeBrowserOptions(cls, options):
+    usecounter.UseCounterMetric.CustomizeBrowserOptions(options)
+
+  def WillNavigateToPage(self, page, tab):
+    self._metric.Start(page, tab)
+
+  def DidNavigateToPage(self, page, tab):
+    self._metric.Stop(page, tab)
+
+  def ValidateAndMeasurePage(self, page, tab, results):
+    self._metric.AddResults(tab, results)