[Offline pages] Resetting offline page metadata store if initial load fails

components/offline_pages/offline_page_model_impl.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_OFFLINE_PAGE_MODEL_IMPL_H_
 #define COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_MODEL_IMPL_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 134 matching lines @@
       int64_t offline_id,
       const SingleOfflinePageItemCallback& callback) const;
   void GetPagesByOnlineURLWhenLoadDone(
       const GURL& online_url,
       const MultipleOfflinePageItemCallback& callback) const;
   void MarkPageAccessedWhenLoadDone(int64_t offline_id);
 
   void CheckMetadataConsistency();
 
   // Callback for loading pages from the offline page metadata store.
-  void OnLoadDone(const base::TimeTicks& start_time,
-                  OfflinePageMetadataStore::LoadStatus load_status,
-                  const std::vector<OfflinePageItem>& offline_pages);
+  void OnGetOfflinePagesDoneForInit(
+      const base::TimeTicks& start_time,
+      StoreState store_state,
+      const std::vector<OfflinePageItem>& offline_pages);
+
+  // Attempts to reset the store.
+  bool MaybeResetStore(const base::TimeTicks& start_time);
+  // Callback for resetting the offline page metadata store.
+  void OnStoreResetDone(const base::TimeTicks& start_time, bool success);
 
   // Steps for saving a page offline.
   void OnCreateArchiveDone(const GURL& requested_url,
                            int64_t offline_id,
                            const ClientId& client_id,
                            const base::Time& start_time,
                            const SavePageCallback& callback,
                            OfflinePageArchiver* archiver,
                            OfflinePageArchiver::ArchiverResult result,
                            const GURL& url,
@@ skipping 104 matching lines @@
   // Manager for the storage consumed by archives and responsible for
   // automatic page clearing.
   std::unique_ptr<OfflinePageStorageManager> storage_manager_;
 
   // Manager for the offline archive files and directory.
   std::unique_ptr<ArchiveManager> archive_manager_;
 
   // Logger to facilitate recording of events.
   OfflinePageModelEventLogger offline_event_logger_;
 
+  // Remaining store reset attempts left. (To prevent infinite attempts.)
+  int store_reset_attempts_left_;
+
   // Clock for getting time in testing code. The setter is responsible to reset
   // it once it is not longer needed.
   base::Clock* testing_clock_;
 
   base::WeakPtrFactory<OfflinePageModelImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(OfflinePageModelImpl);
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_MODEL_IMPL_H_