mac: Expose keychain access frequency to Telemetry.

tools/perf/benchmarks/peacekeeper.py

Index: tools/perf/benchmarks/peacekeeper.py
diff --git a/tools/perf/benchmarks/peacekeeper.py b/tools/perf/benchmarks/peacekeeper.py
index 57b7e62e5e109b68fdbd693940ea27665bfaea1d..677973baac930519def1833362f6fe4fdd0f76f8 100644
--- a/tools/perf/benchmarks/peacekeeper.py
+++ b/tools/perf/benchmarks/peacekeeper.py
@@ -14,15 +14,15 @@ second depending on the test. Final Score is computed by calculating geometric
 mean of individual tests scores.
 """
 
+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 merge_values
 from telemetry.value import scalar
 
 
-class _PeaceKeeperMeasurement(page_test.PageTest):
+class _PeaceKeeperMeasurement(PageTestMeasurement):
 
   def WillNavigateToPage(self, page, tab):
     page.script_to_evaluate_on_commit = """
@@ -51,13 +51,15 @@ class _PeaceKeeperMeasurement(page_test.PageTest):
         }
         """
 
-  def ValidateAndMeasurePage(self, _, tab, results):
+  def ValidateAndMeasurePage(self, page, tab, results):
     tab.WaitForJavaScriptExpression('_done', 600)
     result = tab.EvaluateJavaScript('__results')
 
     results.AddValue(scalar.ScalarValue(
         results.current_page, '%s.Score' % result['test'], 'score',
         int(result['score'])), important=False)
+    super(_PeaceKeeperMeasurement, self).ValidateAndMeasurePage(
+        page, tab, results)
 
   def DidRunTest(self, browser, results):
     # Calculate geometric mean as the total for the combined tests.