MD Bookmarks: Add a confirmation dialog before opening many tabs

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 "base/strings/string16.h"
@@ skipping 63 matching lines @@
   AddLocalizedString(source, "menuOpenNewTab",
                      IDS_BOOKMARK_BAR_OPEN_IN_NEW_TAB);
   AddLocalizedString(source, "menuOpenNewWindow",
                      IDS_BOOKMARK_BAR_OPEN_IN_NEW_WINDOW);
   AddLocalizedString(source, "menuOpenIncognito",
                      IDS_BOOKMARK_BAR_OPEN_INCOGNITO);
   AddLocalizedString(source, "menuRename", IDS_MD_BOOKMARK_MANAGER_MENU_RENAME);
   AddLocalizedString(source, "menuSort", IDS_MD_BOOKMARK_MANAGER_MENU_SORT);
   AddLocalizedString(source, "noSearchResults",
                      IDS_MD_BOOKMARK_MANAGER_NO_SEARCH_RESULTS);
+  AddLocalizedString(source, "openDialogBody",
+                     IDS_BOOKMARK_BAR_SHOULD_OPEN_ALL);
+  AddLocalizedString(source, "openDialogConfirm",
+                     IDS_MD_BOOKMARK_MANAGER_OPEN_DIALOG_CONFIRM);
+  AddLocalizedString(source, "openDialogTitle",
+                     IDS_MD_BOOKMARK_MANAGER_OPEN_DIALOG_TITLE);
   AddLocalizedString(source, "renameFolderTitle",
                      IDS_MD_BOOKMARK_MANAGER_FOLDER_RENAME_TITLE);
   AddLocalizedString(source, "searchPrompt",
                      IDS_BOOKMARK_MANAGER_SEARCH_BUTTON);
   AddLocalizedString(source, "saveEdit", IDS_SAVE);
   AddLocalizedString(source, "title", IDS_MD_BOOKMARK_MANAGER_TITLE);
   AddLocalizedString(source, "toastFolderSorted",
                      IDS_MD_BOOKMARK_MANAGER_TOAST_FOLDER_SORTED);
   AddLocalizedString(source, "toastUrlCopied",
                      IDS_MD_BOOKMARK_MANAGER_TOAST_URL_COPIED);
@@ skipping 83 matching lines @@
       "toastItemsDeleted", IDS_MD_BOOKMARK_MANAGER_TOAST_ITEMS_DELETED);
   web_ui->AddMessageHandler(std::move(plural_string_handler));
 
   web_ui->AddMessageHandler(base::MakeUnique<BookmarksMessageHandler>());
 }
 
 // static
 bool MdBookmarksUI::IsEnabled() {
   return base::FeatureList::IsEnabled(features::kMaterialDesignBookmarks);
 }