Support action button to fetch more content suggestions

components/ntp_snippets/ntp_snippets_service.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/ntp_snippets/ntp_snippets_service.h"
 
 #include <algorithm>
 #include <iterator>
 #include <utility>
 
@@ skipping 266 matching lines @@
 }
 
 CategoryStatus NTPSnippetsService::GetCategoryStatus(Category category) {
   DCHECK(category.IsKnownCategory(KnownCategories::ARTICLES));
   return category_status_;
 }
 
 CategoryInfo NTPSnippetsService::GetCategoryInfo(Category category) {
   return CategoryInfo(
       l10n_util::GetStringUTF16(IDS_NTP_ARTICLE_SUGGESTIONS_SECTION_HEADER),
-      ContentSuggestionsCardLayout::FULL_CARD);
+      ContentSuggestionsCardLayout::FULL_CARD, false);
+}
+
+void NTPSnippetsService::FetchMoreSuggestions(Category category) {
+  // TODO(pke): Move implementation of FetchSnippets down here once the separate
+  // FetchSnippets is not needed by snippets internals anymore, which will
+  // happen once we don't need host restricts anymore.
+  FetchSnippets(true);
 }
 
 void NTPSnippetsService::DismissSuggestion(const std::string& suggestion_id) {
   if (!ready())
     return;
 
   std::string snippet_id = GetWithinCategoryIDFromUniqueID(suggestion_id);
 
   auto it =
       std::find_if(snippets_.begin(), snippets_.end(),
@@ skipping 515 matching lines @@
 void NTPSnippetsService::UpdateCategoryStatus(CategoryStatus status) {
   if (status == category_status_)
     return;
 
   category_status_ = status;
   observer()->OnCategoryStatusChanged(this, provided_category_,
                                       category_status_);
 }
 
 }  // namespace ntp_snippets