Reading List create protobuf store

ios/chrome/browser/reading_list/reading_list_model_storage.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 IOS_CHROME_BROWSER_READING_LIST_READING_LIST_MODEL_STORAGE_H_
 #define IOS_CHROME_BROWSER_READING_LIST_READING_LIST_MODEL_STORAGE_H_
 
 #include <vector>
 
 #include "ios/chrome/browser/reading_list/reading_list_entry.h"
 
-class ReadingListModel;
+class ReadingListModelImpl;
+
+namespace syncer {
+class SyncableService;
+}
 
 // Interface for a persistence layer for reading list.
 // All interface methods have to be called on main thread.
 class ReadingListModelStorage {
  public:
-  virtual std::vector<ReadingListEntry> LoadPersistentReadList() = 0;
-  virtual std::vector<ReadingListEntry> LoadPersistentUnreadList() = 0;
-  virtual bool LoadPersistentHasUnseen() = 0;
+  // Sets the model the Storage is backing.
+  virtual void SetReadingListModel(ReadingListModelImpl* model) = 0;
 
-  virtual void SavePersistentReadList(
-      const std::vector<ReadingListEntry>& read) = 0;
-  virtual void SavePersistentUnreadList(
-      const std::vector<ReadingListEntry>& unread) = 0;
-  virtual void SavePersistentHasUnseen(bool has_unseen) = 0;
+  // Asynchronously Loads the entries contained in the storage.
+  virtual void LoadPersistentLists() = 0;
+
+  // Starts a transation. All Save/Remove entry will be delayed until the
+  // transaction is commited.
+  // Multiple transaction can be started at the same time. Commit will happen
+  // when the last transaction is commited.
+  // Calls to BeginTransaction and CommitTransaction must be balanced.
+  virtual void BeginTransaction() = 0;
+  virtual void CommitTransaction() = 0;
+
+  // Saves or updates an entry. If the entry is not yet in the database, it is
+  // created.
+  virtual void SaveEntry(const ReadingListEntry& entry, bool read) = 0;
+
+  // Removed an entry from the storage.
+  virtual void RemoveEntry(const ReadingListEntry& entry) = 0;
 };
 
 #endif  // IOS_CHROME_BROWSER_READING_LIST_READING_LIST_MODEL_STORAGE_H_