mac: Expose keychain access frequency to Telemetry.

tools/perf/benchmarks/media.py

Index: tools/perf/benchmarks/media.py
diff --git a/tools/perf/benchmarks/media.py b/tools/perf/benchmarks/media.py
index 820fa374d75b903c481eccdddd2071a02df1874f..961eeafc73c70a82ad817b6e2774ee6b48e35bd5 100644
--- a/tools/perf/benchmarks/media.py
+++ b/tools/perf/benchmarks/media.py
@@ -2,15 +2,16 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-from measurements import media
 import page_sets
+
+from measurements import media
+from measurements import PageTestMeasurement
 from telemetry import benchmark
-from telemetry.page import page_test
 from telemetry.value import list_of_scalar_values
 from telemetry.value import scalar
 
 
-class _MSEMeasurement(page_test.PageTest):
+class _MSEMeasurement(PageTestMeasurement):
   def ValidateAndMeasurePage(self, page, tab, results):
     media_metric = tab.EvaluateJavaScript('window.__testMetrics')
     trace = media_metric['id'] if 'id' in media_metric else None
@@ -27,6 +28,7 @@ class _MSEMeasurement(page_test.PageTest):
         results.AddValue(scalar.ScalarValue(
                 results.current_page, trace_name, units='ms',
                 value=float(metrics[m]), important=True))
+    super(_MSEMeasurement, self).ValidateAndMeasurePage(page, tab, results)
 
 
 @benchmark.Disabled('android')