[NTP Snippets] NTPSnippetsService: notify about new suggestions only in changed categories

components/ntp_snippets/remote/ntp_snippets_service.h

Index: components/ntp_snippets/remote/ntp_snippets_service.h
diff --git a/components/ntp_snippets/remote/ntp_snippets_service.h b/components/ntp_snippets/remote/ntp_snippets_service.h
index bfa4e2207068130606c09e0aa84b8cb4de83e053..6af55c661113107e0ec9025f942c84daa168a137 100644
--- a/components/ntp_snippets/remote/ntp_snippets_service.h
+++ b/components/ntp_snippets/remote/ntp_snippets_service.h
@@ -271,9 +271,9 @@ class NTPSnippetsService final : public ContentSuggestionsProvider,
   // Do not call directly, use |EnterState| instead.
   void EnterStateError();
 
-  // Converts the cached snippets to article content suggestions and notifies
-  // the observers.
-  void NotifyNewSuggestions();
+  // Converts the cached snippets in the given |category| to content suggestions
+  // and notifies the observer.
+  void NotifyNewSuggestions(Category category);
 
   // Updates the internal status for |category| to |category_status_| and
   // notifies the content suggestions observer if it changed.