Add long press actions for Most Visited tiles

ios/chrome/browser/ui/content_suggestions/content_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/content_suggestions/content_suggestions_view_controller.h"
 
 #include "base/mac/foundation_util.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"
@@ skipping 230 matching lines @@
   NSIndexPath* touchedItemIndexPath =
       [self.collectionView indexPathForItemAtPoint:touchLocation];
   if (!touchedItemIndexPath ||
       ![self.collectionViewModel hasItemAtIndexPath:touchedItemIndexPath]) {
     // Make sure there is an item at this position.
     return;
   }
   CollectionViewItem* touchedItem =
       [self.collectionViewModel itemAtIndexPath:touchedItemIndexPath];
 
-  if ([self.collectionUpdater contentSuggestionTypeForItem:touchedItem] !=
-      ContentSuggestionTypeArticle) {
-    // Only trigger context menu on articles.
-    return;
+  ContentSuggestionType type =
+      [self.collectionUpdater contentSuggestionTypeForItem:touchedItem];
+  switch (type) {
+    case ContentSuggestionTypeArticle:
+      [self.suggestionCommandHandler
+          displayContextMenuForArticle:touchedItem
+                               atPoint:touchLocation
+                           atIndexPath:touchedItemIndexPath];
+      break;
+    case ContentSuggestionTypeMostVisited:
+      [self.suggestionCommandHandler
+          displayContextMenuForMostVisitedItem:touchedItem
+                                       atPoint:touchLocation
+                                   atIndexPath:touchedItemIndexPath];
+      break;
+    default:
+      break;
   }
 
-  [self.suggestionCommandHandler
-      displayContextMenuForArticle:touchedItem
-                           atPoint:touchLocation
-                       atIndexPath:touchedItemIndexPath];
 }
 
 // Checks if the |section| is empty and add an empty element if it is the case.
 // Must be called from inside a performBatchUpdates: block.
 - (void)addEmptySectionPlaceholderIfNeeded:(NSInteger)section {
   if ([self.collectionViewModel numberOfItemsInSection:section] > 0)
     return;
 
   NSIndexPath* emptyItem =
       [self.collectionUpdater addEmptyItemForSection:section];
   [self.collectionView insertItemsAtIndexPaths:@[ emptyItem ]];
 }
 
 // Tells WebToolbarController to resign focus to the omnibox.
 - (void)blurOmnibox {
   // TODO(crbug.com/700375): once the omnibox is part of Content Suggestions,
   // remove the fake omnibox focus here.
 }
 
 @end