mac: Expose keychain access frequency to Telemetry.

tools/perf/measurements/startup.py

Index: tools/perf/measurements/startup.py
diff --git a/tools/perf/measurements/startup.py b/tools/perf/measurements/startup.py
index 609a621c87ab71a936b0484d26aede8b025fda39..6dfdc5a20104bd4506c425e0886414b2f34c05e8 100644
--- a/tools/perf/measurements/startup.py
+++ b/tools/perf/measurements/startup.py
@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+from metrics import keychain_metric
 from metrics import startup_metric
 from telemetry.page import page_test
 
@@ -29,12 +30,14 @@ class Startup(page_test.PageTest):
     options.AppendExtraBrowserArgs([
         '--enable-stats-collection-bindings'
     ])
+    keychain_metric.KeychainMetric.CustomizeBrowserOptions(options)
 
   def RunNavigateSteps(self, page, tab):
     # Overriden so that no page navigation occurs - startup to the NTP.
     pass
 
   def ValidateAndMeasurePage(self, page, tab, results):
+    keychain_metric.KeychainMetric().AddResults(tab, results)
     startup_metric.StartupMetric().AddResults(tab, results)