mac: Expose keychain access frequency to Telemetry.

tools/perf/measurements/image_decoding.py

 # Copyright 2012 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 measurements import PageTestMeasurement
 from metrics import power
-
 from telemetry.core.platform import tracing_category_filter
 from telemetry.core.platform import tracing_options
-from telemetry.page import page_test
 from telemetry.timeline import model
 from telemetry.value import scalar
 
 
-class ImageDecoding(page_test.PageTest):
+class ImageDecoding(PageTestMeasurement):
   def __init__(self):
     super(ImageDecoding, self).__init__()
     self._power_metric = None
 
   def CustomizeBrowserOptions(self, options):
+    super(ImageDecoding, self).CustomizeBrowserOptions(options)
     options.AppendExtraBrowserArgs('--enable-gpu-benchmarking')
     power.PowerMetric.CustomizeBrowserOptions(options)
 
   def WillStartBrowser(self, platform):
     self._power_metric = power.PowerMetric(platform)
 
   def WillNavigateToPage(self, page, tab):
     tab.ExecuteJavaScript("""
         if (window.chrome &&
             chrome.gpuBenchmarking &&
@@ skipping 25 matching lines @@
     tab.browser.platform.tracing_controller.Start(options, category_filter)
 
   def StopBrowserAfterPage(self, browser, page):
     return not browser.tabs[0].ExecuteJavaScript("""
         window.chrome &&
             chrome.gpuBenchmarking &&
             chrome.gpuBenchmarking.clearImageCache;
     """)
 
   def ValidateAndMeasurePage(self, page, tab, results):
+    super(ImageDecoding, self).ValidateAndMeasurePage(page, tab, results)
     timeline_data = tab.browser.platform.tracing_controller.Stop()
     timeline_model = model.TimelineModel(timeline_data)
     self._power_metric.Stop(page, tab)
     self._power_metric.AddResults(tab, results)
 
     def _IsDone():
       return tab.EvaluateJavaScript('isDone')
 
     decode_image_events = timeline_model.GetAllEventsOfName(
         'ImageFrameGenerator::decode')
@@ skipping 20 matching lines @@
                     'formats: gif, png, jpg, and webp. The image files are '
                     'located at chrome/test/data/image_decoding.'))
     results.AddValue(scalar.ScalarValue(
         results.current_page, 'ImageLoading_avg', 'ms',
         tab.EvaluateJavaScript('averageLoadingTimeMs()')))
 
   def CleanUpAfterPage(self, page, tab):
     tracing_controller = tab.browser.platform.tracing_controller
     if tracing_controller.is_tracing_running:
       tracing_controller.Stop()