FetchMore functionality backend

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 56497a741f085725b8ad2b232d2c69e70fdf0cdf..d24bc5e52a0635a0392e87ce9a956b428ad1b2f0 100644
--- a/components/ntp_snippets/content_suggestions_service.cc
+++ b/components/ntp_snippets/content_suggestions_service.cc
@@ -182,6 +182,14 @@ void ContentSuggestionsService::RegisterProvider(
   providers_.push_back(std::move(provider));
 }
 
+void ContentSuggestionsService::FetchMore(Category category) {
+  auto providers_it = providers_by_category_.find(category);
+  if (providers_it == providers_by_category_.end())
+    return;
+
+  providers_it->second->FetchMore();
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // Private methods