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

components/ntp_snippets/category_info.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/category_info.h"
 
 namespace ntp_snippets {
 
 CategoryInfo::CategoryInfo(const base::string16& title,
                            ContentSuggestionsCardLayout card_layout,
                            bool has_more_button,
-                           bool show_if_empty)
+                           bool show_if_empty,
+                           const base::string16& no_suggestions_message)
     : title_(title),
       card_layout_(card_layout),
       has_more_button_(has_more_button),
-      show_if_empty_(show_if_empty) {}
+      show_if_empty_(show_if_empty),
+      no_suggestions_message_(no_suggestions_message) {}
 
 CategoryInfo::~CategoryInfo() = default;
 
 }  // namespace ntp_snippets