Upstream Chrome on iOS source code [4/11].

ios/chrome/browser/ui/collection_view/cells/collection_view_item.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 IOS_CHROME_BROWSER_UI_COLLECTION_VIEW_CELLS_COLLECTION_VIEW_ITEM_H_
+#define IOS_CHROME_BROWSER_UI_COLLECTION_VIEW_CELLS_COLLECTION_VIEW_ITEM_H_
+
+#import <UIKit/UIKit.h>
+
+@class MDCCollectionViewCell;
+
+// CollectionViewItem holds the model data for a given collection view item.
+@interface CollectionViewItem : NSObject<UIAccessibilityIdentification>
+
+// A client-defined value. It should be unique among items of a given collection
+// view model.
+@property(nonatomic, readonly, assign) NSInteger type;
+
+// The cell class to use in conjunction with this item. Must be a subclass of
+// MDCCollectionViewCell. The default is MDCCollectionViewCell.
+@property(nonatomic, assign) Class cellClass;
+
+- (instancetype)initWithType:(NSInteger)type NS_DESIGNATED_INITIALIZER;
+- (instancetype)init NS_UNAVAILABLE;
+
+// Configures the given cell with the item's information. Override this method
+// to specialize. At this level, only accessibility properties are ported from
+// the item to the cell.
+// The cell's class must match cellClass for the given instance.
+- (void)configureCell:(MDCCollectionViewCell*)cell NS_REQUIRES_SUPER;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_COLLECTION_VIEW_CELLS_COLLECTION_VIEW_ITEM_H_