Move all components/offline_pages/ files into component/offline_pages/core

components/offline_pages/offline_page_metadata_store.h

-// Copyright 2015 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_METADATA_STORE_H_
-#define COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_METADATA_STORE_H_
-
-#include <stdint.h>
-
-#include <vector>
-
-#include "base/callback.h"
-#include "components/offline_pages/offline_page_item.h"
-#include "components/offline_pages/offline_store_types.h"
-
-namespace offline_pages {
-
-typedef StoreUpdateResult<OfflinePageItem> OfflinePagesUpdateResult;
-
-// OfflinePageMetadataStore keeps metadata for the offline pages.
-// Ability to create multiple instances of the store as well as behavior of
-// asynchronous operations when the object is being destroyed, before such
-// operation finishes will depend on implementation. It should be possible to
-// issue multiple asynchronous operations in parallel.
-class OfflinePageMetadataStore {
- public:
-  // This enum is used in an UMA histogram. Hence the entries here shouldn't
-  // be deleted or re-ordered and new ones should be added to the end.
-  enum LoadStatus {
-    LOAD_SUCCEEDED,
-    STORE_INIT_FAILED,
-    STORE_LOAD_FAILED,
-    DATA_PARSING_FAILED,
-
-    // NOTE: always keep this entry at the end.
-    LOAD_STATUS_COUNT
-  };
-
-  typedef base::Callback<void(bool /* success */)> InitializeCallback;
-  typedef base::Callback<void(bool /* success */)> ResetCallback;
-  typedef base::Callback<void(const std::vector<OfflinePageItem>&)>
-      LoadCallback;
-  typedef base::Callback<void(ItemActionStatus)> AddCallback;
-  typedef base::Callback<void(std::unique_ptr<OfflinePagesUpdateResult>)>
-      UpdateCallback;
-
-  virtual ~OfflinePageMetadataStore();
-
-  // Initializes the store. Should be called before any other methods.
-  virtual void Initialize(const InitializeCallback& callback) = 0;
-
-  // Get all of the offline pages from the store.
-  virtual void GetOfflinePages(const LoadCallback& callback) = 0;
-
-  // Asynchronously adds an offline page item metadata to the store.
-  virtual void AddOfflinePage(const OfflinePageItem& offline_page,
-                              const AddCallback& callback) = 0;
-
-  // Asynchronously updates a set of offline page items in the store.
-  virtual void UpdateOfflinePages(const std::vector<OfflinePageItem>& pages,
-                                  const UpdateCallback& callback) = 0;
-
-  // Asynchronously removes offline page metadata from the store.
-  // Result of the update is passed in callback.
-  virtual void RemoveOfflinePages(const std::vector<int64_t>& offline_ids,
-                                  const UpdateCallback& callback) = 0;
-
-  // Resets the store.
-  virtual void Reset(const ResetCallback& callback) = 0;
-
-  // Gets the store state.
-  virtual StoreState state() const = 0;
-};
-
-}  // namespace offline_pages
-
-#endif  // COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_METADATA_STORE_H_