Enable RL sync by default on iOS

components/reading_list/reading_list_model_observer.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_READING_LIST_READING_LIST_MODEL_OBSERVER_H_
-#define COMPONENTS_READING_LIST_READING_LIST_MODEL_OBSERVER_H_
-
-#import <set>
-#import <vector>
-
-class ReadingListModel;
-class ReadingListEntry;
-
-// Observer for the Reading List model. In the observer methods care should be
-// taken to not modify the model.
-class ReadingListModelObserver {
- public:
-  // Invoked when the model has finished loading. Until this method is called it
-  // is unsafe to use the model.
-  virtual void ReadingListModelLoaded(const ReadingListModel* model) = 0;
-
-  // Invoked when the batch updates are about to start. It will only be called
-  // once before ReadingListModelCompletedBatchUpdates, even if several updates
-  // are taking place at the same time.
-  virtual void ReadingListModelBeganBatchUpdates(
-      const ReadingListModel* model) {}
-
-  // Invoked when the batch updates have completed. This is called once all
-  // batch updates are completed.
-  virtual void ReadingListModelCompletedBatchUpdates(
-      const ReadingListModel* model) {}
-
-  // Invoked from the destructor of the model. The model is no longer valid
-  // after this call. There is no need to call RemoveObserver on the model from
-  // here, as the observers are automatically deleted.
-  virtual void ReadingListModelBeingDeleted(const ReadingListModel* model) {}
-
-  // Invoked when elements are about to be removed from the read or unread list.
-  virtual void ReadingListWillRemoveUnreadEntry(const ReadingListModel* model,
-                                                size_t index) {}
-  virtual void ReadingListWillRemoveReadEntry(const ReadingListModel* model,
-                                              size_t index) {}
-  // Invoked when elements are moved from unread to read or from read to unread.
-  // |index| is the original position  and |read| the origin status. The element
-  // will change list and/or index but will not be deleted.
-  virtual void ReadingListWillMoveEntry(const ReadingListModel* model,
-                                        size_t index,
-                                        bool read) {}
-
-  // Invoked when elements are added to the read or the unread list. The new
-  // entries are always added at the beginning. these methods may be called
-  // multiple time (to process changes coming from a synchronization for
-  // example) and they will be executed in call order, the last call will end up
-  // in first position.
-  virtual void ReadingListWillAddUnreadEntry(const ReadingListModel* model,
-                                             const ReadingListEntry& entry) {}
-
-  virtual void ReadingListWillAddReadEntry(const ReadingListModel* model,
-                                           const ReadingListEntry& entry) {}
-
-  // Invoked when an entry is about to change.
-  virtual void ReadingListWillUpdateUnreadEntry(const ReadingListModel* model,
-                                                size_t index) {}
-  virtual void ReadingListWillUpdateReadEntry(const ReadingListModel* model,
-                                              size_t index) {}
-
-  // Called after all the changes signaled by calls to the "Will" methods are
-  // done. All the "Will" methods are called as necessary, then the changes
-  // are applied and then this method is called.
-  virtual void ReadingListDidApplyChanges(ReadingListModel* model) {}
-
- protected:
-  ReadingListModelObserver() {}
-  virtual ~ReadingListModelObserver() {}
-
-  DISALLOW_COPY_AND_ASSIGN(ReadingListModelObserver);
-};
-
-#endif  // COMPONENTS_READING_LIST_READING_LIST_MODEL_OBSERVER_H_