Suggestions UI - expandable item

ios/chrome/browser/ui/suggestions/suggestions_collection_updater.mm

 // 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.
 
 #import "ios/chrome/browser/ui/suggestions/suggestions_collection_updater.h"
 
+#include "base/mac/foundation_util.h"
 #import "ios/chrome/browser/ui/collection_view/collection_view_controller.h"
 #import "ios/chrome/browser/ui/collection_view/collection_view_model.h"
 #import "ios/chrome/browser/ui/suggestions/suggestions_article_item.h"
+#import "ios/chrome/browser/ui/suggestions/suggestions_expandable_item.h"
 #import "ios/chrome/browser/ui/suggestions/suggestions_item.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 namespace {
 typedef NS_ENUM(NSInteger, ItemType) {
   ItemTypeText = kItemTypeEnumZero,
   ItemTypeArticle,
@@ skipping 21 matching lines @@
                                                   subtitle:@"The subtitle"]
           toSectionWithIdentifier:sectionIdentifier];
       [model addItem:
                  [[SuggestionsArticleItem alloc]
                      initWithType:ItemTypeArticle
                             title:@"Title of an Article"
                          subtitle:@"This is the subtitle of an article, can "
                                   @"spawn on multiple lines"
                             image:[UIImage imageNamed:@"distillation_success"]]
           toSectionWithIdentifier:sectionIdentifier];
+      SuggestionsExpandableItem* expandableItem =
+          [[SuggestionsExpandableItem alloc]
+              initWithType:ItemTypeExpand
+                     title:@"Title of an Expandable Article"
+                  subtitle:@"This Article can be expanded to display "
+                           @"addition information or interaction "
+                           @"options"
+                     image:[UIImage imageNamed:@"distillation_fail"]
+                detailText:@"Details shown only when the article is "
+                           @"expanded. It can be displayed on "
+                           @"multiple lines."];
+      expandableItem.collectionView = _collectionViewController.collectionView;
+      [model addItem:expandableItem toSectionWithIdentifier:sectionIdentifier];
       sectionIdentifier++;
     }
   }
   return self;
 }
 
 #pragma mark - Public methods
 
 - (void)addTextItem:(NSString*)title
            subtitle:(NSString*)subtitle
@@ skipping 22 matching lines @@
   [_collectionViewController.collectionView performBatchUpdates:^{
     [_collectionViewController.collectionView
         insertItemsAtIndexPaths:@[ [NSIndexPath
                                     indexPathForRow:numberOfItemsInSection
                                           inSection:sectionIndex] ]];
   }
                                                      completion:nil];
 }
 
 @end