Enable RL sync by default on iOS

components/reading_list/reading_list_model.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_H_
-#define COMPONENTS_READING_LIST_READING_LIST_MODEL_H_
-
-#include <memory>
-#include <string>
-#include <vector>
-
-#include "base/callback.h"
-#include "base/observer_list.h"
-#include "base/threading/non_thread_safe.h"
-#include "components/reading_list/reading_list_entry.h"
-#include "components/reading_list/reading_list_model_observer.h"
-
-class GURL;
-class ReadingListEntry;
-class ReadingListModel;
-class ReadingListStore;
-class ScopedReadingListBatchUpdate;
-
-namespace ios {
-class ChromeBrowserState;
-}
-
-namespace syncer {
-class ModelTypeSyncBridge;
-}
-
-// The reading list model contains two list of entries: one of unread urls, the
-// other of read ones. This object should only be accessed from one thread
-// (Usually the main thread). The observers callbacks are also sent on the main
-// thread.
-class ReadingListModel : public base::NonThreadSafe {
- public:
-  class ScopedReadingListBatchUpdate;
-
-  // Returns true if the model finished loading. Until this returns true the
-  // reading list is not ready for use.
-  virtual bool loaded() const = 0;
-
-  // Returns true if the model is performing batch updates right now.
-  bool IsPerformingBatchUpdates() const;
-
-  // Returns the ModelTypeSyncBridge responsible for handling sync message.
-  virtual syncer::ModelTypeSyncBridge* GetModelTypeSyncBridge() = 0;
-
-  // Tells model to prepare for batch updates.
-  // This method is reentrant, i.e. several batch updates may take place at the
-  // same time.
-  // 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.
-  std::unique_ptr<ScopedReadingListBatchUpdate> BeginBatchUpdates();
-
-  // Creates a batch token that will freeze the model while in scope.
-  virtual std::unique_ptr<ScopedReadingListBatchUpdate> CreateBatchToken();
-
-  // Returns the size of read and unread entries.
-  virtual size_t unread_size() const = 0;
-  virtual size_t read_size() const = 0;
-
-  // Returns true if there are entries in the model that were not seen by the
-  // user yet. Reset to true when new unread entries are added. Reset to false
-  // when ResetUnseenEntries is called.
-  virtual bool HasUnseenEntries() const = 0;
-  virtual void ResetUnseenEntries() = 0;
-
-  // TODO(659099): Remove methods.
-  // Returns a specific entry.
-  virtual const ReadingListEntry& GetUnreadEntryAtIndex(size_t index) const = 0;
-  virtual const ReadingListEntry& GetReadEntryAtIndex(size_t index) const = 0;
-
-  // Returns a specific entry. Returns null if the entry does not exist.
-  // If |read| is not null and the entry is found, |*read| is the read status
-  // of the entry.
-  virtual const ReadingListEntry* GetEntryFromURL(const GURL& gurl,
-                                                  bool* read) const = 0;
-
-  // Synchronously calls the |callback| with entry associated with this |url|.
-  // Does nothing if there is no entry associated.
-  // Returns whether the callback has been called.
-  virtual bool CallbackEntryURL(
-      const GURL& url,
-      base::Callback<void(const ReadingListEntry&)> callback) const = 0;
-
-  // Adds |url| at the top of the unread entries, and removes entries with the
-  // same |url| from everywhere else if they exist. The entry title will be a
-  // trimmed copy of |title.
-  // The addition may be asynchronous, and the data will be available only once
-  // the observers are notified.
-  virtual const ReadingListEntry& AddEntry(const GURL& url,
-                                           const std::string& title) = 0;
-
-  // Removes an entry. The removal may be asynchronous, and not happen
-  // immediately.
-  virtual void RemoveEntryByURL(const GURL& url) = 0;
-
-  // If the |url| is in the reading list and unread, mark it read. If it is in
-  // the reading list and read, move it to the top of unread if it is not here
-  // already. This may trigger deletion of old read entries.
-  virtual void MarkReadByURL(const GURL& url) = 0;
-  // If the |url| is in the reading list and read, mark it unread. If it is in
-  // the reading list and unread, move it to the top of read if it is not here
-  // already.
-  virtual void MarkUnreadByURL(const GURL& url) = 0;
-
-  // Methods to mutate an entry. Will locate the relevant entry by URL. Does
-  // nothing if the entry is not found.
-  virtual void SetEntryTitle(const GURL& url, const std::string& title) = 0;
-  virtual void SetEntryDistilledPath(const GURL& url,
-                                     const base::FilePath& distilled_path) = 0;
-  virtual void SetEntryDistilledState(
-      const GURL& url,
-      ReadingListEntry::DistillationState state) = 0;
-
-  // Observer registration methods. The model will remove all observers upon
-  // destruction automatically.
-  void AddObserver(ReadingListModelObserver* observer);
-  void RemoveObserver(ReadingListModelObserver* observer);
-
-  // Helper class that is used to scope batch updates.
-  class ScopedReadingListBatchUpdate {
-   public:
-    explicit ScopedReadingListBatchUpdate(ReadingListModel* model)
-        : model_(model) {}
-
-    virtual ~ScopedReadingListBatchUpdate();
-
-   private:
-    ReadingListModel* model_;
-
-    DISALLOW_COPY_AND_ASSIGN(ScopedReadingListBatchUpdate);
-  };
-
- protected:
-  ReadingListModel();
-  virtual ~ReadingListModel();
-
-  // The observers.
-  base::ObserverList<ReadingListModelObserver> observers_;
-
-  // Tells model that batch updates have completed. Called from
-  // ReadingListBatchUpdateToken dtor.
-  virtual void EndBatchUpdates();
-
-  // Called when model is entering batch update mode.
-  virtual void EnteringBatchUpdates();
-
-  // Called when model is leaving batch update mode.
-  virtual void LeavingBatchUpdates();
-
- private:
-  unsigned int current_batch_updates_count_;
-
-  DISALLOW_COPY_AND_ASSIGN(ReadingListModel);
-};
-
-#endif  // COMPONENTS_READING_LIST_READING_LIST_MODEL_H_