mac: Expose keychain access frequency to Telemetry.

tools/perf/benchmarks/maps.py

Index: tools/perf/benchmarks/maps.py
diff --git a/tools/perf/benchmarks/maps.py b/tools/perf/benchmarks/maps.py
index efc42dd67aa50e16664231fddbd1f97727bbedde..ed39d55c7cf1679e308695fdd8ff3521610bbf01 100644
--- a/tools/perf/benchmarks/maps.py
+++ b/tools/perf/benchmarks/maps.py
@@ -8,15 +8,15 @@ Rerforms several common navigation actions on the map (pan, zoom, rotate)"""
 import os
 import re
 
+from measurements import PageTestMeasurement
 from telemetry import benchmark
 from telemetry.core import util
 from telemetry.page import page as page_module
 from telemetry.page import page_set as page_set_module
-from telemetry.page import page_test
 from telemetry.value import scalar
 
 
-class _MapsMeasurement(page_test.PageTest):
+class _MapsMeasurement(PageTestMeasurement):
   def ValidateAndMeasurePage(self, page, tab, results):
     js_get_results = 'document.getElementsByTagName("pre")[0].innerText'
     test_results = tab.EvaluateJavaScript(js_get_results)
@@ -27,6 +27,7 @@ class _MapsMeasurement(page_test.PageTest):
         results.current_page, 'total_time', 'ms', total))
     results.AddValue(scalar.ScalarValue(
         results.current_page, 'render_mean_time', 'ms', render))
+    super(_MapsMeasurement, self).ValidateAndMeasurePage(page, tab, results)
 
 class MapsPage(page_module.Page):
   def __init__(self, page_set, base_dir):