mac: Expose keychain access frequency to Telemetry.

tools/perf/benchmarks/dom_perf.py

Index: tools/perf/benchmarks/dom_perf.py
diff --git a/tools/perf/benchmarks/dom_perf.py b/tools/perf/benchmarks/dom_perf.py
index b39c7a13c3eaab271e3a3a29a69bee8151cba70a..8fc94470579b0fd76a4344210c300fee355c2bf6 100644
--- a/tools/perf/benchmarks/dom_perf.py
+++ b/tools/perf/benchmarks/dom_perf.py
@@ -6,10 +6,10 @@ import json
 import math
 import os
 
+from measurements import PageTestMeasurement
 from telemetry import benchmark
 from telemetry.core import util
 from telemetry.page import page_set
-from telemetry.page import page_test
 from telemetry.value import merge_values
 from telemetry.value import scalar
 
@@ -37,7 +37,7 @@ SCORE_UNIT = 'score (bigger is better)'
 SCORE_TRACE_NAME = 'score'
 
 
-class _DomPerfMeasurement(page_test.PageTest):
+class _DomPerfMeasurement(PageTestMeasurement):
   def ValidateAndMeasurePage(self, page, tab, results):
     try:
       def _IsDone():
@@ -51,8 +51,11 @@ class _DomPerfMeasurement(page_test.PageTest):
           results.AddValue(scalar.ScalarValue(
               results.current_page, '%s.%s' % (suite['name'], SCORE_TRACE_NAME),
               SCORE_UNIT, suite['score'], important=False))
+
     finally:
       tab.EvaluateJavaScript('document.cookie = "__domperf_finished=0"')
+    super(_DomPerfMeasurement, self).ValidateAndMeasurePage(
+        page, tab, results)
 
   def DidRunTest(self, browser, results):
     # Now give the geometric mean as the total for the combined runs.