[Offline pages] Resetting offline page metadata store to handle LOAD/INIT failures

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 132 matching lines @@
   const std::vector<int64_t> MaybeGetOfflineIdsForClientId(
       const ClientId& client_id) 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 OnStoreInitialized(const base::TimeTicks& start_time,
+                          int reset_attempts_left,
+                          bool success);
+  void OnStoreResetDone(const base::TimeTicks& start_time,
+                        int reset_attempts_left,
+                        bool success);
   void OnLoadDone(const base::TimeTicks& start_time,
-                  OfflinePageMetadataStore::LoadStatus load_status,
                   const std::vector<OfflinePageItem>& offline_pages);
+  void CompleteLoad();
 
   // 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 69 matching lines @@
 
   // Clears expired pages if there are any.
   void ClearStorageIfNeeded(
       const OfflinePageStorageManager::ClearStorageCallback& callback);
 
   // Callback completing storage clearing.
   void OnStorageCleared(size_t expired_page_count,
                         OfflinePageStorageManager::ClearStorageResult result);
 
   // Post task to clear storage.
-  void PostClearStorageIfNeededTask();
+  void PostClearStorageIfNeededTask(bool delayed);
 
   // Check if |offline_page| should be removed on cache reset by user.
   bool IsRemovedOnCacheReset(const OfflinePageItem& offline_page) const;
 
   void RunWhenLoaded(const base::Closure& job);
 
   base::Time GetCurrentTime() const;
 
   // Persistent store for offline page metadata.
   std::unique_ptr<OfflinePageMetadataStore> store_;
@@ skipping 33 matching lines @@
   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_