Added a PolicyDomainDescriptor.

chrome/browser/policy/cloud/component_cloud_policy_service.h

Index: chrome/browser/policy/cloud/component_cloud_policy_service.h
diff --git a/chrome/browser/policy/cloud/component_cloud_policy_service.h b/chrome/browser/policy/cloud/component_cloud_policy_service.h
index 1f248f11cde944abc19552141c21992fecc0fb82..fefbd154775b5c99bcc8027a7f8e88be8bf22d7b 100644
--- a/chrome/browser/policy/cloud/component_cloud_policy_service.h
+++ b/chrome/browser/policy/cloud/component_cloud_policy_service.h
@@ -83,13 +83,12 @@ class ComponentCloudPolicyService : public CloudPolicyClient::Observer,
   // remote policy data.
   void Disconnect();
 
-  // |component_ids| is the complete set of components to track for the given
-  // |domain|. This purges unused components from the cache, and starts
-  // updating the components in |component_ids|.
-  // It's only valid to call this for domains that are supported, i.e.
-  // SupportsDomain(domain) is true.
-  void RegisterPolicyDomain(PolicyDomain domain,
-                            const std::set<std::string>& component_ids);
+  // |descriptor| lists the complete set of components to track for its domain.
+  // This purges unused components from the cache, and starts updating the
+  // components listed in the descriptor. It's only valid to call this for
+  // domains that are supported, i.e. SupportsDomain(domain) is true.
+  void RegisterPolicyDomain(
+      scoped_refptr<const PolicyDomainDescriptor> descriptor);
 
   // CloudPolicyClient::Observer implementation:
   virtual void OnPolicyFetched(CloudPolicyClient* client) OVERRIDE;