[MD Bookmarks] Add a message to empty bookmark lists.

chrome/browser/ui/webui/md_bookmarks/md_bookmarks_ui.cc

 // Copyright (c) 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 "chrome/browser/ui/webui/md_bookmarks/md_bookmarks_ui.h"
 
 #include <algorithm>
 
 #include "base/strings/string16.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 16 matching lines @@
   source->AddString(message, str);
 }
 
 content::WebUIDataSource* CreateMdBookmarksUIHTMLSource(Profile* profile) {
   content::WebUIDataSource* source =
       content::WebUIDataSource::Create(chrome::kChromeUIBookmarksHost);
 
   // Localized strings (alphabetical order).
   AddLocalizedString(source, "clearSearch",
                      IDS_MD_BOOKMARK_MANAGER_CLEAR_SEARCH);
+  AddLocalizedString(source, "emptyList",
+                     IDS_MD_BOOKMARK_MANAGER_EMPTY_LIST);
   AddLocalizedString(source, "menuAddBookmark",
                      IDS_MD_BOOKMARK_MANAGER_MENU_ADD_BOOKMARK);
   AddLocalizedString(source, "menuAddFolder",
                      IDS_MD_BOOKMARK_MANAGER_MENU_ADD_FOLDER);
   AddLocalizedString(source, "menuBulkEdit",
                      IDS_MD_BOOKMARK_MANAGER_MENU_BULK_EDIT);
   AddLocalizedString(source, "menuCopyURL",
                      IDS_MD_BOOKMARK_MANAGER_MENU_COPY_URL);
   AddLocalizedString(source, "menuDelete", IDS_DELETE);
   AddLocalizedString(source, "menuEdit", IDS_EDIT);
@@ skipping 38 matching lines @@
   // Set up the chrome://bookmarks/ source.
   Profile* profile = Profile::FromWebUI(web_ui);
   content::WebUIDataSource::Add(profile,
                                 CreateMdBookmarksUIHTMLSource(profile));
 }
 
 // static
 bool MdBookmarksUI::IsEnabled() {
   return base::FeatureList::IsEnabled(features::kMaterialDesignBookmarks);
 }