MD Bookmarks: Add a confirmation dialog before opening many tabs

chrome/browser/resources/md_bookmarks/command_manager.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 
 <link rel="import" href="chrome://resources/cr_elements/cr_action_menu/cr_action_menu.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_lazy_render/cr_lazy_render.html">
 <link rel="import" href="chrome://resources/html/cr/ui/command.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-a11y-keys-behavior/iron-a11y-keys-behavior.html">
 <link rel="import" href="chrome://bookmarks/edit_dialog.html">
 <link rel="import" href="chrome://bookmarks/shared_style.html">
 <link rel="import" href="chrome://bookmarks/store_client.html">
 
@@ skipping 28 matching lines @@
           <span class="sublabel">
             [[getCommandSublabel_(command, menuIds_)]]
           </span>
         </button>
         <hr hidden$="[[!showDividerAfter_(command, menuIds_)]]"></hr>
       </template>
     </dialog>
     <template is="cr-lazy-render" id="editDialog">
       <bookmarks-edit-dialog></bookmarks-edit-dialog>
     </template>
+    <template is="cr-lazy-render" id="openDialog">
+      <dialog is="cr-dialog">
+        <div class="title">$i18n{openDialogTitle}</div>
+        <div class="body"></div>
+        <div class="button-container">
+          <paper-button class="cancel-button" on-tap="onOpenCancelTap_">
+            $i18n{cancel}
+          </paper-button>
+          <paper-button class="action-button" on-tap="onOpenConfirmTap_">
+            $i18n{openDialogConfirm}
+          </paper-button>
+        </div>
+      </dialog>
+    </template>
   </template>
   <script src="chrome://bookmarks/command_manager.js"></script>
 </dom-module>