[Offline pages] Applying StoreState to track RequestQueueStore state

components/offline_pages/background/request_queue_store_sql.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_OFFLINE_PAGES_BACKGROUND_REQUEST_QUEUE_STORE_SQL_H_
 #define COMPONENTS_OFFLINE_PAGES_BACKGROUND_REQUEST_QUEUE_STORE_SQL_H_
 
 #include <stdint.h>
-
 #include <memory>
 #include <vector>
 
 #include "base/files/file_path.h"
 #include "base/memory/weak_ptr.h"
 #include "components/offline_pages/background/request_queue_store.h"
 
 namespace base {
 class SequencedTaskRunner;
 }
@@ skipping 18 matching lines @@
                   const AddCallback& callback) override;
   void UpdateRequests(const std::vector<SavePageRequest>& requests,
                       const UpdateCallback& callback) override;
   void RemoveRequests(const std::vector<int64_t>& request_ids,
                       const RemoveCallback& callback) override;
   void ChangeRequestsState(
       const std::vector<int64_t>& request_ids,
       const SavePageRequest::RequestState new_state,
       const UpdateMultipleRequestsCallback& callback) override;
   void Reset(const ResetCallback& callback) override;
+  StoreState state() const override;
 
  private:
   // Helper functions to return immediately if no database is found.
   bool CheckDb(const base::Closure& callback);
 
   // Used to initialize DB connection.
   void OpenConnection();
-  void OnOpenConnectionDone(bool success);
+  void OnOpenConnectionDone(StoreState state);
 
   // Used to finalize connection reset.
-  void OnResetDone(const ResetCallback& callback, bool success);
+  void OnResetDone(const ResetCallback& callback, StoreState state);
 
   // Background thread where all SQL access should be run.
   scoped_refptr<base::SequencedTaskRunner> background_task_runner_;
 
   // Path to the database on disk.
   base::FilePath db_file_path_;
 
   // Database connection.
   std::unique_ptr<sql::Connection> db_;
 
+  // State of the store.
+  StoreState state_;
+
   base::WeakPtrFactory<RequestQueueStoreSQL> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(RequestQueueStoreSQL);
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_BACKGROUND_REQUEST_QUEUE_STORE_SQL_H_