FetchMore functionality backend

components/ntp_snippets/content_suggestions_service.h

 // 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.
 
 #ifndef COMPONENTS_NTP_SNIPPETS_CONTENT_SUGGESTIONS_SERVICE_H_
 #define COMPONENTS_NTP_SNIPPETS_CONTENT_SUGGESTIONS_SERVICE_H_
 
 #include <map>
 #include <memory>
 #include <set>
@@ skipping 111 matching lines @@
   void DismissSuggestion(const ContentSuggestion::ID& suggestion_id);
 
   // Dismisses the given |category|, if it exists.
   // This will not trigger an update through the observers.
   void DismissCategory(Category category);
 
   // Restores all dismissed categories.
   // This will not trigger an update through the observers.
   void RestoreDismissedCategories();
 
+  // Manually triggers the provider of the category to fetch content that is not
+  // already loaded.

[Marc Treib, 2016/10/18 08:17:45]

This shouldn't talk about providers - users of this class don't care about that.
Instead, describe what it does - what's the expected result?

[fhorschig, 2016/10/20 13:10:38]

Done.

+  void FetchMore(Category category) ;
+
   // Observer accessors.
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
   // Registers a new ContentSuggestionsProvider. It must be ensured that at most
   // one provider is registered for every category and that this method is
   // called only once per provider.
   void RegisterProvider(std::unique_ptr<ContentSuggestionsProvider> provider);
 
   // Removes history from the specified time range where the URL matches the
@@ skipping 131 matching lines @@
   NTPSnippetsService* ntp_snippets_service_;
 
   UserClassifier user_classifier_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentSuggestionsService);
 };
 
 }  // namespace ntp_snippets
 
 #endif  // COMPONENTS_NTP_SNIPPETS_CONTENT_SUGGESTIONS_SERVICE_H_