Add Store+Sync to reading list.

ios/chrome/browser/reading_list/reading_list_model_storage.h

Index: ios/chrome/browser/reading_list/reading_list_model_storage.h
diff --git a/ios/chrome/browser/reading_list/reading_list_model_storage.h b/ios/chrome/browser/reading_list/reading_list_model_storage.h
index e55b1d5cba13798e76c92619590b5b8bfe073f1b..9fe680d84fd2324671129501501dc35a8a4945ec 100644
--- a/ios/chrome/browser/reading_list/reading_list_model_storage.h
+++ b/ios/chrome/browser/reading_list/reading_list_model_storage.h
@@ -10,18 +10,46 @@
 #include "ios/chrome/browser/reading_list/reading_list_entry.h"
 
 class ReadingListModel;
+class ReadingListStoreDelegate;
+
+namespace syncer {
+class ModelTypeSyncBridge;
+}
 
 // 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;
+  class ScopedBatchUpdate;
+
+  // Sets the model the Storage is backing.
+  // This will trigger store initalization and load persistent entries.
+  virtual void SetReadingListModel(ReadingListModel* model,
+                                   ReadingListStoreDelegate* delegate) = 0;
+
+  // Returns the class responsible for handling sync messages.
+  virtual syncer::ModelTypeSyncBridge* GetModelTypeSyncBridge() = 0;
+
+  // Starts a transaction. 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.
+  // Returns a scoped batch update object that should be retained while the
+  // batch update is performed. Deallocating this object will inform model that
+  // the batch update has completed.
+  virtual std::unique_ptr<ScopedBatchUpdate> EnsureBatchCreated() = 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;
 
-  virtual void SavePersistentReadList(
-      const std::vector<ReadingListEntry>& read) = 0;
-  virtual void SavePersistentUnreadList(
-      const std::vector<ReadingListEntry>& unread) = 0;
+  class ScopedBatchUpdate {
+   public:
+    virtual ~ScopedBatchUpdate() {}
+  };
 };
 
 #endif  // IOS_CHROME_BROWSER_READING_LIST_READING_LIST_MODEL_STORAGE_H_