ComponentCloudPolicyService tracks the signin state.

components/policy/core/common/policy_switches.cc

 // Copyright 2013 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 "components/policy/core/common/policy_switches.h"
 
 namespace policy {
 namespace switches {
 
 // The maximum amount of delay in ms between receiving a cloud policy
 // invalidation and fetching the policy. A random delay up to this value is used
 // to prevent Chrome clients from overwhelming the cloud policy server when a
 // policy which affects many users is changed.
 const char kCloudPolicyInvalidationDelay[]  = "cloud-policy-invalidation-delay";
 
 // Disables pushing cloud policy to Chrome using an invalidation service.
 const char kDisableCloudPolicyPush[]        = "disable-cloud-policy-push";
 
+// Enables fetching and storing cloud policy for components. This currently
+// supports policy for extensions on Chrome OS.
+const char kEnableComponentCloudPolicy[]    = "enable-component-cloud-policy";
+
 #if defined(OS_ANDROID) || defined(OS_IOS)
 // Registers for cloud policy using the BROWSER client type instead of the
 // ANDROID_BROWSER or IOS_BROWSER types.
 // This allows skipping the server whitelist.
 // TODO(joaodasilva): remove this. http://crbug.com/248527
 const char kFakeCloudPolicyType[]           = "fake-cloud-policy-type";
 #endif  // defined(OS_ANDROID) || defined(OS_IOS)
 
 }  // namespace switches
 }  // namespace policy