Allow policy refresh rate to be configured through policy.

chrome/browser/policy/config_dir_policy_provider_unittest.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <algorithm>
 
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/scoped_temp_dir.h"
 #include "base/string_number_conversions.h"
@@ skipping 302 matching lines @@
             kPolicyExtensionInstallAllowList,
             key::kExtensionInstallAllowList),
         ValueTestParams::ForListPolicy(
             kPolicyExtensionInstallDenyList,
             key::kExtensionInstallDenyList),
         ValueTestParams::ForBooleanPolicy(
             kPolicyShowHomeButton,
             key::kShowHomeButton),
         ValueTestParams::ForBooleanPolicy(
             kPolicyPrintingEnabled,
-            key::kPrintingEnabled)));
+            key::kPrintingEnabled),
+        ValueTestParams::ForIntegerPolicy(
+            kPolicyPolicyRefreshRate,
+            key::kPolicyRefreshRate)));
 
 }  // namespace policy