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

components/update_client/update_engine.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_ENGINE_H_
 #define COMPONENTS_UPDATE_CLIENT_UPDATE_ENGINE_H_
 
 #include <list>
 #include <queue>
 #include <set>
@@ skipping 59 matching lines @@
   base::ThreadChecker thread_checker_;
 
   scoped_refptr<Configurator> config_;
 
   UpdateChecker::Factory update_checker_factory_;
   CrxDownloader::Factory crx_downloader_factory_;
 
   // TODO(sorin): refactor as a ref counted class.
   PingManager* ping_manager_;  // Not owned by this class.
 
+  std::unique_ptr<PersistedData> metadata_;
+
   // Called when CRX state changes occur.
   const NotifyObserversCallback notify_observers_callback_;
 
   // Contains the contexts associated with each update in progress.
   std::set<UpdateContext*> update_contexts_;
 
   // Implements a rate limiting mechanism for background update checks. Has the
   // effect of rejecting the update call if the update call occurs before
   // a certain time, which is negotiated with the server as part of the
   // update protocol. See the comments for X-Retry-After header.
@@ skipping 56 matching lines @@
   // Contains the ids of the items to update.
   std::queue<std::string> queue;
 
   // The time in seconds to wait until doing further update checks.
   int retry_after_sec_;
 };
 
 }  // namespace update_client
 
 #endif  // COMPONENTS_UPDATE_CLIENT_UPDATE_ENGINE_H_