mac: Expose keychain access frequency to Telemetry.

tools/perf/benchmarks/jetstream.py

Index: tools/perf/benchmarks/jetstream.py
diff --git a/tools/perf/benchmarks/jetstream.py b/tools/perf/benchmarks/jetstream.py
index e22a72cea311a5631862319322b93db2db6d1aa4..b757163661a637f65b0d1b2692f070b4ed74878c 100644
--- a/tools/perf/benchmarks/jetstream.py
+++ b/tools/perf/benchmarks/jetstream.py
@@ -20,14 +20,14 @@ specialized optimization for one benchmark might make another benchmark slower.
 import json
 import os
 
+from measurements import PageTestMeasurement
 from telemetry import benchmark
 from telemetry.page import page_set
-from telemetry.page import page_test
 from telemetry.util import statistics
 from telemetry.value import list_of_scalar_values
 
 
-class _JetstreamMeasurement(page_test.PageTest):
+class _JetstreamMeasurement(PageTestMeasurement):
   def __init__(self):
     super(_JetstreamMeasurement, self).__init__()
 
@@ -73,6 +73,8 @@ class _JetstreamMeasurement(page_test.PageTest):
       all_scores.append(statistics.GeometricMean(score_list))
     results.AddSummaryValue(list_of_scalar_values.ListOfScalarValues(
         None, 'Score', 'score', all_scores))
+    super(_JetstreamMeasurement, self).ValidateAndMeasurePage(
+        page, tab, results)
 
 
 @benchmark.Disabled('android', 'xp')  # crbug.com/381742