[MD Bookmarks] Edit Bookmarks.

chrome/browser/resources/md_bookmarks/list.js

 // 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.
 
 Polymer({
   is: 'bookmarks-list',
 
   properties: {
     /** @type {BookmarkTreeNode} */
     selectedNode: Object,
@@ skipping 12 matching lines @@
    */
   onOpenItemMenu_: function(e) {
     this.menuItem_ = e.detail.item;
     var menu = /** @type {!CrActionMenuElement} */ (
         this.$.dropdown);
     menu.showAt(/** @type {!Element} */ (e.detail.target));
   },
 
   // TODO(jiaxi): change these dummy click event handlers later.
   /** @private */
   onEditTap_: function() {

[tsergeant, 2017/01/09 00:21:04]

I think you should probably assert or if-guard to check that menuItem_ is not a
folder.

If you select edit bookmark on a folder, you can set a URL on it, which goofs up
the UI in weird ways.

Obviously, you'll change that by changing the menu for folders, but it's still
good to be defensive.

[jiaxi, 2017/01/09 02:17:46]

Done.

     this.closeDropdownMenu_();
+    this.$.editBookmark.showModal();
   },
 
   /** @private */
   onCopyURLTap_: function() {
     var idList = [this.menuItem_.id];
     chrome.bookmarkManagerPrivate.copy(idList, function() {
       // TODO(jiaxi): Add toast later.
     });
     this.closeDropdownMenu_();
   },
 
   /** @private */
   onDeleteTap_: function() {
     if (this.menuItem_.children) {
       chrome.bookmarks.removeTree(this.menuItem_.id, function() {
         // TODO(jiaxi): Add toast later.
       }.bind(this));
     } else {
       chrome.bookmarks.remove(this.menuItem_.id, function() {
         // TODO(jiaxi): Add toast later.
       }.bind(this));
     }
     this.closeDropdownMenu_();
   },
 
   /** @private */
+  onSaveEditTap_: function() {
+    chrome.bookmarks.update(this.menuItem_.id, {
+      'title': this.menuItem_.title,
+      'url': this.menuItem_.url,
+    });
+    this.$.editBookmark.close();
+  },
+
+  /** @private */
+  onCancelEditTap_: function() {
+    this.$.editBookmark.cancel();
+  },
+
+  /** @private */
   closeDropdownMenu_: function() {
     var menu = /** @type {!CrActionMenuElement} */ (
         this.$.dropdown);
     menu.close();
   }
 });