MD Bookmarks: Add full support for cut/copy/paste keyboard shortcuts

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 <string>
 #include <unordered_set>
 #include <utility>
@@ skipping 169 matching lines @@
 
 MdBookmarksUI::MdBookmarksUI(content::WebUI* web_ui) : WebUIController(web_ui) {
   // Set up the chrome://bookmarks/ source.
   Profile* profile = Profile::FromWebUI(web_ui);
   content::WebUIDataSource::Add(profile,
                                 CreateMdBookmarksUIHTMLSource(profile));
 
   auto plural_string_handler = base::MakeUnique<PluralStringHandler>();
   plural_string_handler->AddLocalizedString(
       "toastItemsDeleted", IDS_MD_BOOKMARK_MANAGER_TOAST_ITEMS_DELETED);
+  plural_string_handler->AddLocalizedString(
+      "toastItemsCopied", IDS_MD_BOOKMARK_MANAGER_TOAST_ITEMS_COPIED);
   web_ui->AddMessageHandler(std::move(plural_string_handler));
 
   web_ui->AddMessageHandler(base::MakeUnique<BookmarksMessageHandler>());
 }
 
 // static
 bool MdBookmarksUI::IsEnabled() {
   return base::FeatureList::IsEnabled(features::kMaterialDesignBookmarks);
 }