mac: Expose keychain access frequency to Telemetry.

tools/perf/measurements/page_cycler.py

Index: tools/perf/measurements/page_cycler.py
diff --git a/tools/perf/measurements/page_cycler.py b/tools/perf/measurements/page_cycler.py
index d70b9110dcbe20518aaac9b306cf5f0ee7aebe63..ee145e8faf68413fb7f6216b06b40c5c9341a1f0 100644
--- a/tools/perf/measurements/page_cycler.py
+++ b/tools/perf/measurements/page_cycler.py
@@ -18,6 +18,7 @@ cycling all pages.
 import collections
 import os
 
+from measurements import PageTestMeasurement
 from metrics import cpu
 from metrics import iometric
 from metrics import memory
@@ -25,11 +26,10 @@ from metrics import power
 from metrics import speedindex
 from metrics import v8_object_stats
 from telemetry.core import util
-from telemetry.page import page_test
 from telemetry.value import scalar
 
 
-class PageCycler(page_test.PageTest):
+class PageCycler(PageTestMeasurement):
   options = {'pageset_repeat': 10}
 
   def __init__(self, *args, **kwargs):
@@ -118,6 +118,7 @@ class PageCycler(page_test.PageTest):
       self._v8_object_stats_metric.Start(page, tab)
 
   def CustomizeBrowserOptions(self, options):
+    super(PageCycler, self).CustomizeBrowserOptions(options)
     memory.MemoryMetric.CustomizeBrowserOptions(options)
     power.PowerMetric.CustomizeBrowserOptions(options)
     iometric.IOMetric.CustomizeBrowserOptions(options)
@@ -129,6 +130,7 @@ class PageCycler(page_test.PageTest):
       self._speedindex_metric.CustomizeBrowserOptions(options)
 
   def ValidateAndMeasurePage(self, page, tab, results):
+    super(PageCycler, self).ValidateAndMeasurePage(page, tab, results)
     tab.WaitForJavaScriptExpression('__pc_load_time', 60)
 
     chart_name_prefix = ('cold_' if self.IsRunCold(page.url) else