Upstream Chrome on iOS source code [3/11].

ios/chrome/browser/ui/bookmarks/bookmark_position_cache.h

+// Copyright 2014 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_UI_BOOKMARKS_BOOKMARK_POSITION_CACHE_H_
+#define IOS_CHROME_BROWSER_UI_BOOKMARKS_BOOKMARK_POSITION_CACHE_H_
+
+#import <Foundation/Foundation.h>
+
+#include <stdint.h>
+
+#include "base/macros.h"
+#import "ios/chrome/browser/ui/bookmarks/bookmark_menu_item.h"
+
+// Caches the user's position in the bookmark hierarchy navigator, as well as
+// enough information to recreate the primary menu item.
+@interface BookmarkPositionCache : NSObject<NSCoding>
+
+@property(nonatomic, assign, readonly) int64_t folderId;
+@property(nonatomic, assign, readonly) CGFloat position;
+@property(nonatomic, assign, readonly) bookmarks::MenuItemType type;
+
++ (BookmarkPositionCache*)cacheForMenuItemAllWithPosition:(CGFloat)position;
++ (BookmarkPositionCache*)cacheForMenuItemFolderWithPosition:(CGFloat)position
+                                                    folderId:(int64_t)folderId;
+
+// This is not the designated initializer. It will return nil if there are
+// problems with the decoding process.
+- (instancetype)initWithCoder:(NSCoder*)coder;
+@end
+
+@interface BookmarkPositionCache (ExposedForTesting)
+- (instancetype)initWithFolderId:(int64_t)folderId
+                        position:(CGFloat)position
+                            type:(bookmarks::MenuItemType)type;
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_BOOKMARKS_BOOKMARK_POSITION_CACHE_H_