mac: Expose keychain access frequency to Telemetry.

tools/perf/benchmarks/blink_perf.py

Index: tools/perf/benchmarks/blink_perf.py
diff --git a/tools/perf/benchmarks/blink_perf.py b/tools/perf/benchmarks/blink_perf.py
index 20d3a025ebceeb4bfbb020b69684339d4fe674d4..71309e6b82f68e8e88455e81ba6abfd4e7ea3842 100644
--- a/tools/perf/benchmarks/blink_perf.py
+++ b/tools/perf/benchmarks/blink_perf.py
@@ -4,10 +4,10 @@
 
 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 list_of_scalar_values
 
 
@@ -59,7 +59,7 @@ def _CreatePageSetFromPath(path, skipped_file):
   return ps
 
 
-class _BlinkPerfMeasurement(page_test.PageTest):
+class _BlinkPerfMeasurement(PageTestMeasurement):
   """Tuns a blink performance test and reports the results."""
   def __init__(self):
     super(_BlinkPerfMeasurement, self).__init__('')
@@ -71,6 +71,7 @@ class _BlinkPerfMeasurement(page_test.PageTest):
     page.script_to_evaluate_on_commit = self._blink_perf_js
 
   def CustomizeBrowserOptions(self, options):
+    super(_BlinkPerfMeasurement, self).CustomizeBrowserOptions(options)
     options.AppendExtraBrowserArgs([
         '--js-flags=--expose_gc',
         '--enable-experimental-web-platform-features',
@@ -78,6 +79,8 @@ class _BlinkPerfMeasurement(page_test.PageTest):
     ])
 
   def ValidateAndMeasurePage(self, page, tab, results):
+    super(_BlinkPerfMeasurement, self).ValidateAndMeasurePage(
+        page, tab, results)
     tab.WaitForJavaScriptExpression('testRunner.isDone', 600)
 
     log = tab.EvaluateJavaScript('document.getElementById("log").innerHTML')