mac: Expose keychain access frequency to Telemetry.

tools/perf/measurements/memory.py

Index: tools/perf/measurements/memory.py
diff --git a/tools/perf/measurements/memory.py b/tools/perf/measurements/memory.py
index a9cfb8d601154de1a98bf53a19abd94b956ad0bc..33ff4bb25f1ed05c21bde12abb2f362543c61859 100644
--- a/tools/perf/measurements/memory.py
+++ b/tools/perf/measurements/memory.py
@@ -2,11 +2,11 @@
 # 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 memory
 from metrics import power
-from telemetry.page import page_test
 
-class Memory(page_test.PageTest):
+class Memory(PageTestMeasurement):
   def __init__(self):
     super(Memory, self).__init__('RunPageInteractions')
     self._memory_metric = None
@@ -23,12 +23,14 @@ class Memory(page_test.PageTest):
     self._power_metric.Start(page, tab)
 
   def CustomizeBrowserOptions(self, options):
+    super(Memory, self).CustomizeBrowserOptions(options)
     memory.MemoryMetric.CustomizeBrowserOptions(options)
     # Since this is a memory benchmark, we want to sample memory histograms at
     # a high frequency.
     options.AppendExtraBrowserArgs('--memory-metrics')
 
   def ValidateAndMeasurePage(self, page, tab, results):
+    super(Memory, self).ValidateAndMeasurePage(page, tab, results)
     self._power_metric.Stop(page, tab)
     self._memory_metric.Stop(page, tab)
     self._memory_metric.AddResults(tab, results)