[NTP Snippets] Pass "no suggestions" message from the backend to the UI

components/ntp_snippets/remote/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/remote/ntp_snippets_service.h"
 
 #include <algorithm>
 #include <iterator>
 #include <utility>
 
@@ skipping 295 matching lines @@
 }
 
 CategoryStatus NTPSnippetsService::GetCategoryStatus(Category category) {
   DCHECK(base::ContainsKey(categories_, category));
   return categories_[category].status;
 }
 
 CategoryInfo NTPSnippetsService::GetCategoryInfo(Category category) {
   DCHECK(base::ContainsKey(categories_, category));
   const CategoryContent& content = categories_[category];
-  return CategoryInfo(content.localized_title,
-                      ContentSuggestionsCardLayout::FULL_CARD,
-                      /*has_more_button=*/false,
-                      /*show_if_empty=*/true);
+  return CategoryInfo(
+      content.localized_title, ContentSuggestionsCardLayout::FULL_CARD,
+      /*has_more_button=*/false,
+      /*show_if_empty=*/true,
+      l10n_util::GetStringUTF16(IDS_NTP_ARTICLE_SUGGESTIONS_SECTION_EMPTY));
 }
 
 void NTPSnippetsService::DismissSuggestion(
     const ContentSuggestion::ID& suggestion_id) {
   if (!ready())
     return;
 
   DCHECK(base::ContainsKey(categories_, suggestion_id.category()));
 
   CategoryContent* content = &categories_[suggestion_id.category()];
@@ skipping 779 matching lines @@
 }
 
 NTPSnippetsService::CategoryContent::CategoryContent() = default;
 NTPSnippetsService::CategoryContent::CategoryContent(CategoryContent&&) =
     default;
 NTPSnippetsService::CategoryContent::~CategoryContent() = default;
 NTPSnippetsService::CategoryContent& NTPSnippetsService::CategoryContent::
 operator=(CategoryContent&&) = default;
 
 }  // namespace ntp_snippets