mac: Expose keychain access frequency to Telemetry.

base/perf_util.cc

Index: base/perf_util.cc
diff --git a/base/critical_closure_internal_ios.mm b/base/perf_util.cc
similarity index 51%
copy from base/critical_closure_internal_ios.mm
copy to base/perf_util.cc
index b8fec141b2198e53c2b8e2d4826a1fba7edc0212..ee814cc34ea563678c27b8d1e41c4aab7c2b929c 100644
--- a/base/critical_closure_internal_ios.mm
+++ b/base/perf_util.cc
@@ -2,16 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/critical_closure.h"
+#include "base/perf_util.h"
 
-#import <UIKit/UIKit.h>
+#include "base/metrics/histogram.h"
 
 namespace base {
-namespace internal {
 
-bool IsMultiTaskingSupported() {
-  return [[UIDevice currentDevice] isMultitaskingSupported];
+void IncrementKeychainAccessHistogram() {
+  LOCAL_HISTOGRAM_BOOLEAN("OSX.Keychain.Access", true);
 }
 
-}  // namespace internal
 }  // namespace base