mac: Expose keychain access frequency to Telemetry.

tools/perf/benchmarks/canvasmark.py

Index: tools/perf/benchmarks/canvasmark.py
diff --git a/tools/perf/benchmarks/canvasmark.py b/tools/perf/benchmarks/canvasmark.py
index 55a219b338c60d4fa30c70fd8e6589683cfb98a7..dacac775aeeb54dc9b45b0bcc4253509dc8e83c5 100644
--- a/tools/perf/benchmarks/canvasmark.py
+++ b/tools/perf/benchmarks/canvasmark.py
@@ -11,13 +11,13 @@ fills, shadows and text functions.
 
 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 _CanvasMarkMeasurement(page_test.PageTest):
+class _CanvasMarkMeasurement(PageTestMeasurement):
 
   def WillNavigateToPage(self, page, tab):
     page.script_to_evaluate_on_commit = """
@@ -29,7 +29,7 @@ class _CanvasMarkMeasurement(page_test.PageTest):
         }
         """
 
-  def ValidateAndMeasurePage(self, _, tab, results):
+  def ValidateAndMeasurePage(self, page, tab, results):
     tab.WaitForJavaScriptExpression('__results.length == 8', 300)
     results_log = tab.EvaluateJavaScript('__results')
     total = 0
@@ -48,6 +48,8 @@ class _CanvasMarkMeasurement(page_test.PageTest):
     results.AddValue(scalar.ScalarValue(
         results.current_page, 'Score', 'score', total))
 
+    super(_CanvasMarkMeasurement, self).ValidateAndMeasurePage(
+        page, tab, results)
 
 @benchmark.Disabled
 class CanvasMark(benchmark.Benchmark):