Adds accessoryType property to CollectionViewItem

ios/chrome/browser/ui/collection_view/cells/collection_view_item.h

Index: ios/chrome/browser/ui/collection_view/cells/collection_view_item.h
diff --git a/ios/chrome/browser/ui/collection_view/cells/collection_view_item.h b/ios/chrome/browser/ui/collection_view/cells/collection_view_item.h
index 78be71e4899e9ad81da799879a5aa1fe75460f85..71459276848e45fd104db43a70ef33089cbddb03 100644
--- a/ios/chrome/browser/ui/collection_view/cells/collection_view_item.h
+++ b/ios/chrome/browser/ui/collection_view/cells/collection_view_item.h
@@ -7,11 +7,14 @@
 
 #import <UIKit/UIKit.h>
 
-@class MDCCollectionViewCell;
+#import "ios/third_party/material_components_ios/src/components/CollectionCells/src/MaterialCollectionCells.h"
 
 // CollectionViewItem holds the model data for a given collection view item.
 @interface CollectionViewItem : NSObject<UIAccessibilityIdentification>
 
+// The accessory type for the cell.
+@property(nonatomic) MDCCollectionViewCellAccessoryType accessoryType;
+
 // A client-defined value. It should be unique among items of a given collection
 // view model.
 @property(nonatomic, readonly, assign) NSInteger type;