Add module for counting date-last-roll-call and persisting those counts

components/update_client/update_client.h

 // Copyright 2015 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_UPDATE_CLIENT_UPDATE_CLIENT_H_
 #define COMPONENTS_UPDATE_CLIENT_UPDATE_CLIENT_H_
 
 #include <stdint.h>
 #include <string>
 #include <vector>
@@ skipping 110 matching lines @@
 // is achieved using a template method.
 //
 // State changes of a CRX could generate events, which are observed using a
 // subject-observer interface.
 //
 // The actions chain up. In some sense, the actions implement a state machine,
 // as the CRX undergoes a series of state transitions in the process of
 // being checked for updates and applying the update.
 
 class ComponentsUI;
+class PrefRegistrySimple;
 
 namespace base {
 class DictionaryValue;
 class FilePath;
 }
 
 namespace update_client {
 
 class Configurator;
 struct CrxUpdateItem;
@@ skipping 182 matching lines @@
  protected:
   friend class base::RefCounted<UpdateClient>;
 
   virtual ~UpdateClient() {}
 };
 
 // Creates an instance of the update client.
 scoped_refptr<UpdateClient> UpdateClientFactory(
     const scoped_refptr<Configurator>& config);
 
+// This must be called prior to the construction of any Configurator that
+// contains a PrefService.
+void RegisterPrefs(PrefRegistrySimple* registry);
+
 }  // namespace update_client
 
 #endif  // COMPONENTS_UPDATE_CLIENT_UPDATE_CLIENT_H_