Support action button to fetch more content suggestions

components/ntp_snippets/content_suggestions_service.cc

Index: components/ntp_snippets/content_suggestions_service.cc
diff --git a/components/ntp_snippets/content_suggestions_service.cc b/components/ntp_snippets/content_suggestions_service.cc
index 3311d45624a4372568a304e857f205ae9f105b79..5f0fd9ba4d27e3ef9e5d961ee0ec99eae635a33e 100644
--- a/components/ntp_snippets/content_suggestions_service.cc
+++ b/components/ntp_snippets/content_suggestions_service.cc
@@ -66,6 +66,12 @@ ContentSuggestionsService::GetSuggestionsForCategory(Category category) const {
   return iterator->second;
 }
 
+void ContentSuggestionsService::FetchMoreSuggestions(Category category) {
+  auto iterator = providers_by_category_.find(category);
+  if (iterator != providers_by_category_.end())
+    iterator->second->FetchMoreSuggestions(category);
+}
+
 void ContentSuggestionsService::FetchSuggestionImage(
     const std::string& suggestion_id,
     const ImageFetchedCallback& callback) {