[NTP::SectionOrder] Propagate new order through ContentSuggestionsService.

components/ntp_snippets/content_suggestions_service.cc

 // Copyright 2016 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/content_suggestions_service.h"
 
 #include <algorithm>
 #include <iterator>
 #include <set>
 #include <utility>
@@ skipping 48 matching lines @@
     observer.ContentSuggestionsServiceShutdown();
   }
 }
 
 // static
 void ContentSuggestionsService::RegisterProfilePrefs(
     PrefRegistrySimple* registry) {
   registry->RegisterListPref(prefs::kDismissedCategories);
 }
 
+const std::vector<Category>& ContentSuggestionsService::GetCategories() {
+  SortCategories();
+  return categories_;
+}
+
 CategoryStatus ContentSuggestionsService::GetCategoryStatus(
     Category category) const {
   if (state_ == State::DISABLED) {
     return CategoryStatus::ALL_SUGGESTIONS_EXPLICITLY_DISABLED;
   }
 
   auto iterator = providers_by_category_.find(category);
   if (iterator == providers_by_category_.end()) {
     return CategoryStatus::NOT_PROVIDED;
   }
@@ skipping 416 matching lines @@
 void ContentSuggestionsService::StoreDismissedCategoriesToPrefs() {
   base::ListValue list;
   for (const auto& category_provider_pair : dismissed_providers_by_category_) {
     list.AppendInteger(category_provider_pair.first.id());
   }
 
   pref_service_->Set(prefs::kDismissedCategories, list);
 }
 
 }  // namespace ntp_snippets