Add to ComponentCloudPolicyService comment

components/policy/core/common/cloud/component_cloud_policy_service.h

 // Copyright (c) 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.
 
 #ifndef COMPONENTS_POLICY_CORE_COMMON_CLOUD_COMPONENT_CLOUD_POLICY_SERVICE_H_
 #define COMPONENTS_POLICY_CORE_COMMON_CLOUD_COMPONENT_CLOUD_POLICY_SERVICE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 18 matching lines @@
 namespace net {
 class URLRequestContextGetter;
 }
 
 namespace policy {
 
 class ExternalPolicyDataFetcherBackend;
 class ResourceCache;
 class SchemaMap;
 
-// Manages cloud policy for components.
+// Manages cloud policy for components (currently used for device local accounts
+// and policy for extensions --> go/cros-ent-p4ext-dd).
 //
 // This class takes care of fetching, validating, storing and updating policy
 // for components.
 //
 // Note that the policies for all components, as returned by the server, are
 // downloaded and cached, regardless of the current state of the schema
 // registry. However, exposed are only the policies whose components are present
 // in the schema registry.
 //
 // The exposed policies are guaranteed to be conformant to the corresponding
@@ skipping 141 matching lines @@
 
   // Must be the last member.
   base::WeakPtrFactory<ComponentCloudPolicyService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ComponentCloudPolicyService);
 };
 
 }  // namespace policy
 
 #endif  // COMPONENTS_POLICY_CORE_COMMON_CLOUD_COMPONENT_CLOUD_POLICY_SERVICE_H_