ContentSuggestions collection adds items with animation

ios/chrome/browser/ui/content_suggestions/content_suggestions_collection_updater.h

Index: ios/chrome/browser/ui/content_suggestions/content_suggestions_collection_updater.h
diff --git a/ios/chrome/browser/ui/content_suggestions/content_suggestions_collection_updater.h b/ios/chrome/browser/ui/content_suggestions/content_suggestions_collection_updater.h
index f1c79f69f4e905c7613353772a9451d8ad3d5361..6661d090081ccbaefb3e66837aaf24ed42f941f2 100644
--- a/ios/chrome/browser/ui/content_suggestions/content_suggestions_collection_updater.h
+++ b/ios/chrome/browser/ui/content_suggestions/content_suggestions_collection_updater.h
@@ -34,6 +34,17 @@
 // Returns the ContentSuggestionType associated with this item.
 - (ContentSuggestionType)contentSuggestionTypeForItem:(CollectionViewItem*)item;
 
+// Adds the sections for the |suggestions| to the model and returns their
+// indices.
+- (NSIndexSet*)addSectionsForSuggestionsToModel:
+    (NSArray<ContentSuggestion*>*)suggestions;
+
+// Adds the |suggestions| to the model and returns their index paths.
+// The caller must ensure the corresponding sections have been added to the
+// model.
+- (NSArray<NSIndexPath*>*)addSuggestionsToModel:
+    (NSArray<ContentSuggestion*>*)suggestions;
+
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_CONTENT_SUGGESTIONS_CONTENT_SUGGESTIONS_COLLECTION_UPDATER_H_