Add MostVistedSites to ContentSuggestionsMediator

ios/chrome/browser/ui/content_suggestions/content_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/content_suggestions/content_suggestions_collection_updater.h"
 
 #include "base/logging.h"
 #include "base/mac/foundation_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/time/time.h"
@@ skipping 26 matching lines @@
     CollectionViewItem<ContentSuggestionIdentification>;
 using CSCollectionViewModel = CollectionViewModel<CSCollectionViewItem*>;
 
 // Enum defining the ItemType of this ContentSuggestionsCollectionUpdater.
 typedef NS_ENUM(NSInteger, ItemType) {
   ItemTypeArticle = kItemTypeEnumZero,
   ItemTypeFooter,
   ItemTypeHeader,
   ItemTypeEmpty,
   ItemTypeReadingList,
+  ItemTypeMostVisited,
 };
 
 typedef NS_ENUM(NSInteger, SectionIdentifier) {
   SectionIdentifierArticles = kSectionIdentifierEnumZero,
   SectionIdentifierReadingList,
+  SectionIdentifierMostVisited,
   SectionIdentifierDefault,
 };
 
 // Update ContentSuggestionTypeForItemType if you update this function.
 ItemType ItemTypeForContentSuggestionType(ContentSuggestionType type) {
   switch (type) {
     case ContentSuggestionTypeArticle:
       return ItemTypeArticle;
     case ContentSuggestionTypeEmpty:
       return ItemTypeEmpty;
     case ContentSuggestionTypeReadingList:
       return ItemTypeReadingList;
+    case ContentSuggestionTypeMostVisited:
+      return ItemTypeMostVisited;
   }
 }
 
 ContentSuggestionType ContentSuggestionTypeForItemType(NSInteger type) {
   if (type == ItemTypeArticle)
     return ContentSuggestionTypeArticle;
   if (type == ItemTypeEmpty)
     return ContentSuggestionTypeEmpty;
   if (type == ItemTypeReadingList)
     return ContentSuggestionTypeReadingList;
+  if (type == ItemTypeMostVisited)
+    return ContentSuggestionTypeMostVisited;
   // Add new type here
 
   // Default type.
   return ContentSuggestionTypeEmpty;
 }
 
 // Returns the section identifier corresponding to the section |info|.
 SectionIdentifier SectionIdentifierForInfo(
     ContentSuggestionsSectionInformation* info) {
   switch (info.sectionID) {
     case ContentSuggestionsSectionArticles:
       return SectionIdentifierArticles;
 
     case ContentSuggestionsSectionReadingList:
       return SectionIdentifierReadingList;
 
+    case ContentSuggestionsSectionMostVisited:
+      return SectionIdentifierMostVisited;
+
     case ContentSuggestionsSectionUnknown:
       return SectionIdentifierDefault;
   }
 }
 
 }  // namespace
 
 @interface ContentSuggestionsCollectionUpdater ()<
     ContentSuggestionsArticleItemDelegate,
     ContentSuggestionsDataSink>
@@ skipping 92 matching lines @@
 }
 
 - (void)clearSection:(ContentSuggestionsSectionInformation*)sectionInfo {
   SectionIdentifier sectionIdentifier = SectionIdentifierForInfo(sectionInfo);
   NSInteger section = [self.collectionViewController.collectionViewModel
       sectionIdentifierForSection:sectionIdentifier];
 
   [self.collectionViewController dismissSection:section];
 }
 
+- (void)reloadSection:(ContentSuggestionsSectionInformation*)sectionInfo {
+  // TODO(crbug.com/707754): implement this method.
+}
+
+- (void)faviconAvailableForURL:(const GURL&)URL {
+  // TODO(crbug.com/707754): implement this method.
+}
+
 #pragma mark - Public methods
 
 - (BOOL)shouldUseCustomStyleForSection:(NSInteger)section {
   NSNumber* identifier = @([self.collectionViewController.collectionViewModel
       sectionIdentifierForSection:section]);
   ContentSuggestionsSectionInformation* sectionInformation =
       self.sectionInfoBySectionIdentifier[identifier];
   return sectionInformation.layout == ContentSuggestionsSectionLayoutCustom;
 }
 
@@ skipping 59 matching lines @@
         readingListItem.title = suggestion.title;
         readingListItem.subtitle = suggestion.publisher;
 
         readingListItem.suggestionIdentifier = suggestion.suggestionIdentifier;
 
         NSIndexPath* addedIndexPath = [self addItem:readingListItem
                             toSectionWithIdentifier:sectionIdentifier];
         [indexPaths addObject:addedIndexPath];
         break;
       }
+      case ContentSuggestionTypeMostVisited: {
+        // TODO(crbug.com/707754): Add the most visited item.
+        break;
+      }
     }
   }
 
   return indexPaths;
 }
 
 - (NSIndexSet*)addSectionsForSuggestionsToModel:
     (NSArray<ContentSuggestion*>*)suggestions {
   NSMutableIndexSet* indexSet = [NSMutableIndexSet indexSet];
 
@@ skipping 209 matching lines @@
         [model sectionIdentifierForSection:sectionNumber];
     if ([model hasItem:item inSectionWithIdentifier:sectionIdentifier]) {
       [self.collectionViewController
           reconfigureCellsForItems:@[ item ]
            inSectionWithIdentifier:sectionIdentifier];
     }
   }
 }
 
 @end