[MD Bookmarks] Add search.

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,
+    menuItem_: Object,
 
-    /** @type {BookmarkTreeNode} */
-    menuItem_: Object,
+    /** @type {Array<BookmarkTreeNode>} */
+    displayedList: Array,
   },
 
   listeners: {
     'open-item-menu': 'onOpenItemMenu_',
   },
 
   /**
    * @param {Event} e
    * @private
    */
@@ skipping 16 matching lines @@
   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) {
+    if (this.menuItem_.url) {
+      chrome.bookmarks.remove(this.menuItem_.id, function() {
+        // TODO(jiaxi): Add toast later.
+      }.bind(this));
+    } else {
       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();
   },
 
   /** @private */
   isListEmpty_: function() {
-    return this.selectedNode.children.length == 0;
+    return this.displayedList.length == 0;
   }
 });