mac: Expose keychain access frequency to Telemetry.

tools/perf/benchmarks/browsermark.py

Index: tools/perf/benchmarks/browsermark.py
diff --git a/tools/perf/benchmarks/browsermark.py b/tools/perf/benchmarks/browsermark.py
index cfc98d3e6ee147d6e0a18bb2e76417c619221161..d5099f597124cd6f8150923d3aa50c0c2d217729 100644
--- a/tools/perf/benchmarks/browsermark.py
+++ b/tools/perf/benchmarks/browsermark.py
@@ -20,14 +20,14 @@ tests are not included in this suite.
 
 import os
 
+from measurements import PageTestMeasurement
 from telemetry import benchmark
 from telemetry.page import page_set
-from telemetry.page import page_test
 from telemetry.value import scalar
 
-class _BrowsermarkMeasurement(page_test.PageTest):
+class _BrowsermarkMeasurement(PageTestMeasurement):
 
-  def ValidateAndMeasurePage(self, _, tab, results):
+  def ValidateAndMeasurePage(self, page, tab, results):
     # Select nearest server(North America=1) and start test.
     js_start_test =  """
         for (var i=0; i < $('#continent a').length; i++) {
@@ -45,6 +45,9 @@ class _BrowsermarkMeasurement(page_test.PageTest):
     results.AddValue(
         scalar.ScalarValue(results.current_page, 'Score', 'score', result))
 
+    super(_BrowsermarkMeasurement, self).ValidateAndMeasurePage(
+        page, tab, results)
+
 
 @benchmark.Disabled
 class Browsermark(benchmark.Benchmark):