mac: Expose keychain access frequency to Telemetry.

tools/perf/measurements/image_decoding.py

Index: tools/perf/measurements/image_decoding.py
diff --git a/tools/perf/measurements/image_decoding.py b/tools/perf/measurements/image_decoding.py
index f3608532e570cb7e8003f7efddeacd27a1be7f5d..015b87df28153c8f0f78c712f4456df26b47ab3d 100644
--- a/tools/perf/measurements/image_decoding.py
+++ b/tools/perf/measurements/image_decoding.py
@@ -2,21 +2,21 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+from measurements import PageTestMeasurement
 from metrics import power
-
 from telemetry.core.platform import tracing_category_filter
 from telemetry.core.platform import tracing_options
-from telemetry.page import page_test
 from telemetry.timeline import model
 from telemetry.value import scalar
 
 
-class ImageDecoding(page_test.PageTest):
+class ImageDecoding(PageTestMeasurement):
   def __init__(self):
     super(ImageDecoding, self).__init__()
     self._power_metric = None
 
   def CustomizeBrowserOptions(self, options):
+    super(ImageDecoding, self).CustomizeBrowserOptions(options)
     options.AppendExtraBrowserArgs('--enable-gpu-benchmarking')
     power.PowerMetric.CustomizeBrowserOptions(options)
 
@@ -62,6 +62,7 @@ class ImageDecoding(page_test.PageTest):
     """)
 
   def ValidateAndMeasurePage(self, page, tab, results):
+    super(ImageDecoding, self).ValidateAndMeasurePage(page, tab, results)
     timeline_data = tab.browser.platform.tracing_controller.Stop()
     timeline_model = model.TimelineModel(timeline_data)
     self._power_metric.Stop(page, tab)