Suggestions UI - stack item

ios/chrome/browser/ui/suggestions/suggestions_collection_updater.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_SUGGESTIONS_SUGGESTIONS_COLLECTION_UPDATER_H_
 #define IOS_CHROME_BROWSER_UI_SUGGESTIONS_SUGGESTIONS_COLLECTION_UPDATER_H_
 
 #import <UIKit/UIKit.h>
 
+#import "ios/chrome/browser/ui/collection_view/collection_view_model.h"
+
 @class SuggestionsViewController;
 
+// Enum defining the ItemType of this SuggestionsCollectionUpdater.
+typedef NS_ENUM(NSInteger, ItemType) {
+  ItemTypeText = kItemTypeEnumZero,
+  ItemTypeArticle,
+  ItemTypeExpand,
+  ItemTypeStack,
+};
+
 // Updater for a CollectionViewController populating it with some items and
 // handling the items addition.
 @interface SuggestionsCollectionUpdater : NSObject
 
-// |collectionViewController| this Updater will update.
-- (instancetype)initWithCollectionViewController:
-    (SuggestionsViewController*)collectionViewController
-    NS_DESIGNATED_INITIALIZER;
-- (instancetype)init NS_UNAVAILABLE;
+// |collectionViewController| this Updater will update. Needs to be set before
+// adding items.
+@property(nonatomic, assign)
+    SuggestionsViewController* collectionViewController;
 
 // Adds a text item with a |title| and a |subtitle| in the section numbered
 // |section|. If |section| is greater than the current number of section, it
 // will add a new section at the end.
 - (void)addTextItem:(NSString*)title
            subtitle:(NSString*)subtitle
           toSection:(NSInteger)inputSection;
 
+// Returns whether the section should use the default, non-card style.
+- (BOOL)isCustomStyling:(NSInteger)section;
+
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_SUGGESTIONS_SUGGESTIONS_COLLECTION_UPDATER_H_