Add more features to ntp-tiles-internal

components/ntp_tiles/most_visited_sites.h

 // Copyright 2013 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.
 
 #ifndef COMPONENTS_NTP_TILES_MOST_VISITED_SITES_H_
 #define COMPONENTS_NTP_TILES_MOST_VISITED_SITES_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 83 matching lines @@
   // features will be disabled.
   MostVisitedSites(PrefService* prefs,
                    scoped_refptr<history::TopSites> top_sites,
                    suggestions::SuggestionsService* suggestions,
                    std::unique_ptr<PopularSites> popular_sites,
                    std::unique_ptr<IconCacher> icon_cacher,
                    std::unique_ptr<MostVisitedSitesSupervisor> supervisor);
 
   ~MostVisitedSites() override;
 
+  // Returns true if this object was created with a non-null provider for the
+  // given NTP tile source. That source may or may not actually provide tiles,
+  // depending on its configuration and the priority of different sources.
+  bool DoesSourceExist(NTPTileSource source) const;
+
+  // Returns the corresponding object passed at construction.
+  history::TopSites* top_sites() { return top_sites_.get(); }
+  suggestions::SuggestionsService* suggestions() {
+    return suggestions_service_;
+  }
+  PopularSites* popular_sites() { return popular_sites_.get(); }
+  MostVisitedSitesSupervisor* supervisor() { return supervisor_.get(); }
+
   // Sets the observer, and immediately fetches the current suggestions.
   // Does not take ownership of |observer|, which must outlive this object and
   // must not be null.
   void SetMostVisitedURLsObserver(Observer* observer, int num_sites);
 
   // Requests an asynchronous refresh of the suggestions. Notifies the observer
   // once the request completes.
   void Refresh();
 
   void AddOrRemoveBlacklistedUrl(const GURL& url, bool add_url);
@@ skipping 88 matching lines @@
   // For callbacks may be run after destruction, used exclusively for TopSites
   // (since it's used to detect whether there's a query in flight).
   base::WeakPtrFactory<MostVisitedSites> top_sites_weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MostVisitedSites);
 };
 
 }  // namespace ntp_tiles
 
 #endif  // COMPONENTS_NTP_TILES_MOST_VISITED_SITES_H_