FetchMore functionality backend

components/ntp_snippets/content_suggestions_service.h

Index: components/ntp_snippets/content_suggestions_service.h
diff --git a/components/ntp_snippets/content_suggestions_service.h b/components/ntp_snippets/content_suggestions_service.h
index 928a3a04151d9eb0adc2e5ff7c0a4410834a5be2..bea462a9868a7fba4c41632b41da6795923fe980 100644
--- a/components/ntp_snippets/content_suggestions_service.h
+++ b/components/ntp_snippets/content_suggestions_service.h
@@ -129,6 +129,10 @@ class ContentSuggestionsService : public KeyedService,
   // 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);