Add ContentSuggestion for ReadingList

ios/chrome/browser/content_suggestions/content_suggestions_mediator.mm

 // Copyright 2017 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/content_suggestions/content_suggestions_mediator.h"
 
 #include "base/mac/bind_objc_block.h"
 #include "base/memory/ptr_util.h"
 #include "base/optional.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 26 matching lines @@
                             suggestions)> callback,
     ntp_snippets::Status status_code,
     std::vector<ntp_snippets::ContentSuggestion> suggestions) {
   if (callback) {
     callback.Run(status_code, suggestions);
   }
 }
 
 // Returns the Type for this |category|.
 ContentSuggestionType TypeForCategory(ntp_snippets::Category category) {
-  // For now, only Article is a relevant type.
-  return ContentSuggestionTypeArticle;
+  if (category.IsKnownCategory(ntp_snippets::KnownCategories::ARTICLES))
+    return ContentSuggestionTypeArticle;
+  if (category.IsKnownCategory(ntp_snippets::KnownCategories::READING_LIST))
+    return ContentSuggestionTypeReadingList;
+
+  return ContentSuggestionTypeEmpty;
 }
 
 // Returns the section ID for this |category|.
 ContentSuggestionsSectionID SectionIDForCategory(
     ntp_snippets::Category category) {
   if (category.IsKnownCategory(ntp_snippets::KnownCategories::BOOKMARKS))
     return ContentSuggestionsSectionBookmarks;
   if (category.IsKnownCategory(ntp_snippets::KnownCategories::ARTICLES))
     return ContentSuggestionsSectionArticles;
+  if (category.IsKnownCategory(ntp_snippets::KnownCategories::READING_LIST))
+    return ContentSuggestionsSectionReadingList;
 
   return ContentSuggestionsSectionUnknown;
 }
 
 // Returns the section layout corresponding to the category |layout|.
 ContentSuggestionsSectionLayout SectionLayoutForLayout(
     ntp_snippets::ContentSuggestionsCardLayout layout) {
   // For now, only cards are relevant.
   return ContentSuggestionsSectionLayoutCard;
 }
@@ skipping 309 matching lines @@
         [NSMutableArray array];
     ntp_snippets::Category category = suggestions[0].id().category();
     [self addSuggestions:suggestions
             fromCategory:category
                  toArray:contentSuggestions];
     callback(contentSuggestions);
   }
 }
 
 @end