Suggestions UI - Add Data Source and Item

ios/chrome/browser/ui/suggestions/suggestions_view_controller.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_view_controller.h"
 
 #import "ios/chrome/browser/ui/collection_view/cells/MDCCollectionViewCell+Chrome.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_item.h"
 #import "ios/chrome/browser/ui/collection_view/collection_view_model.h"
+#import "ios/chrome/browser/ui/suggestions/suggestions_collection_updater.h"
 #import "ios/chrome/browser/ui/suggestions/suggestions_commands.h"
 #import "ios/chrome/browser/ui/suggestions/suggestions_item_actions.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 @interface SuggestionsViewController ()<SuggestionsItemActions>
 
+@property(nonatomic, strong) SuggestionsCollectionUpdater* collectionUpdater;
+
 @end
 
 @implementation SuggestionsViewController
 
 @synthesize suggestionCommandHandler = _suggestionCommandHandler;
+@synthesize collectionUpdater = _collectionUpdater;
 
 #pragma mark - UIViewController
 
 - (void)viewDidLoad {
   [super viewDidLoad];
 
+  _collectionUpdater = [[SuggestionsCollectionUpdater alloc]
+      initWithCollectionViewController:self];
+
   self.collectionView.delegate = self;
   self.styler.cellStyle = MDCCollectionViewCellStyleCard;
 }
 
 #pragma mark - MDCCollectionViewStylingDelegate
 
 - (CGFloat)collectionView:(UICollectionView*)collectionView
     cellHeightAtIndexPath:(NSIndexPath*)indexPath {
   CollectionViewItem* item =
       [self.collectionViewModel itemAtIndexPath:indexPath];
   UIEdgeInsets inset = [self collectionView:collectionView
                                      layout:collectionView.collectionViewLayout
                      insetForSectionAtIndex:indexPath.section];
 
   return [MDCCollectionViewCell
       cr_preferredHeightForWidth:CGRectGetWidth(collectionView.bounds) -
                                  inset.left - inset.right
                          forItem:item];
 }
 
 #pragma mark - SuggestionsItemActions
 
 - (void)addNewItem:(id)sender {
   [self.suggestionCommandHandler addEmptyItem];
 }
 
+#pragma mark - SuggestionsCollectionUpdater forwarding
+
+- (void)addTextItem:(NSString*)title
+           subtitle:(NSString*)subtitle
+          toSection:(NSInteger)inputSection {
+  [self.collectionUpdater addTextItem:title
+                             subtitle:subtitle
+                            toSection:inputSection];
+}
+
 @end