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

components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.h

Index: components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.h
diff --git a/components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.h b/components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.h
index 934dd74038ec4c42dda26eb0444874e28bec909e..8b3b08d70cb208da86feabbbef077b07e0cd47c0 100644
--- a/components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.h
+++ b/components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.h
@@ -5,6 +5,7 @@
 #ifndef COMPONENTS_NTP_SNIPPETS_PHYSICAL_WEB_PAGES_PHYSICAL_WEB_PAGE_SUGGESTIONS_PROVIDER_H_
 #define COMPONENTS_NTP_SNIPPETS_PHYSICAL_WEB_PAGES_PHYSICAL_WEB_PAGE_SUGGESTIONS_PROVIDER_H_
 
+#include <set>
 #include <string>
 #include <vector>
 
@@ -48,6 +49,9 @@ class PhysicalWebPageSuggestionsProvider : 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,