Fetch incremental updates. Store new state in V4Store.

components/safe_browsing_db/v4_local_database_manager.h

 // Copyright 2016 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_SAFE_BROWSING_DB_V4_LOCAL_DATABASE_MANAGER_H_
 #define COMPONENTS_SAFE_BROWSING_DB_V4_LOCAL_DATABASE_MANAGER_H_
 
 // A class that provides the interface between the SafeBrowsing protocol manager
 // and database that holds the downloaded updates.
 
@@ skipping 54 matching lines @@
   void UpdateRequestCompleted(const std::vector<ListUpdateResponse>& responses);
 
   void SetupUpdateProtocolManager(
       net::URLRequestContextGetter* request_context_getter,
       const V4ProtocolConfig& config);
 
   void SetupDatabase();
 
   void DatabaseReady(std::unique_ptr<V4Database> v4_database);
 
-  void OnCloseDatabase();
+  // Called when the database has been updated and schedules the next update.
+  void DatabaseUpdated();
 
   // The base directory under which to create the files that contain hashes.
   const base::FilePath base_path_;
 
   // Whether the service is running.
   bool enabled_;
 
   // Stores the current status of the lists to download from the SafeBrowsing
   // servers.
   // TODO(vakh): current_list_states_ doesn't really belong here.
   // It should come through the database, from the various V4Stores.
   base::hash_map<UpdateListIdentifier, std::string> current_list_states_;
 
   // The protocol manager that downloads the hash prefix updates.
   std::unique_ptr<V4UpdateProtocolManager> v4_update_protocol_manager_;
 
   // The database that manages the stores containing the hash prefix updates.
   // All writes to this variable must happen on the IO thread only.
   std::unique_ptr<V4Database> v4_database_;
 
+  // Called when the V4Database has finished applying the latest update and is
+  // ready to process next update.
+  DatabaseUpdatedCallback db_updated_callback_;
+
   // The sequenced task runner for running safe browsing database operations.
   scoped_refptr<base::SequencedTaskRunner> task_runner_;
 
   friend class base::RefCountedThreadSafe<V4LocalDatabaseManager>;
   DISALLOW_COPY_AND_ASSIGN(V4LocalDatabaseManager);
 };  // class V4LocalDatabaseManager
 
 }  // namespace safe_browsing
 
 #endif  // COMPONENTS_SAFE_BROWSING_DB_V4_LOCAL_DATABASE_MANAGER_H_