Adds a Fetch() method to the ContentSuggestionService which asks any provider to provide more conte…

components/ntp_snippets/bookmarks/bookmark_suggestions_provider.h

Index: components/ntp_snippets/bookmarks/bookmark_suggestions_provider.h
diff --git a/components/ntp_snippets/bookmarks/bookmark_suggestions_provider.h b/components/ntp_snippets/bookmarks/bookmark_suggestions_provider.h
index 2bf8ebb0fe2c0a9df2101ac73bc27f50d6cea797..bc6b6133999e978e289d62297aab0514e02ba7a2 100644
--- a/components/ntp_snippets/bookmarks/bookmark_suggestions_provider.h
+++ b/components/ntp_snippets/bookmarks/bookmark_suggestions_provider.h
@@ -42,6 +42,9 @@ class BookmarkSuggestionsProvider : public ContentSuggestionsProvider,
   void DismissSuggestion(const ContentSuggestion::ID& suggestion_id) override;
   void FetchSuggestionImage(const ContentSuggestion::ID& suggestion_id,
                             const ImageFetchedCallback& callback) override;
+  void Fetch(const Category& category,
+             const std::set<std::string>& known_suggestion_ids,
+             FetchingCallback callback) override;
   void ClearHistory(
       base::Time begin,
       base::Time end,