MD Bookmarks: Focus sidebar nodes on click without showing an outline

chrome/browser/resources/md_bookmarks/item.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-item',
 
   behaviors: [
+    bookmarks.MouseFocusBehavior,
     bookmarks.StoreClient,
   ],
 
   properties: {
     itemId: {
       type: String,
       observer: 'onItemIdChanged_',
     },
 
     ironListTabIndex: String,
 
     /** @private {BookmarkNode} */
     item_: {
       type: Object,
       observer: 'onItemChanged_',
     },
 
     /** @private */
     isSelectedItem_: {
       type: Boolean,
       reflectToAttribute: true,
     },
 
     /** @private */
-    mouseFocus_: {
-      type: Boolean,
-      reflectToAttribute: true,
-    },
-
-    /** @private */
     isFolder_: Boolean,
   },
 
   observers: [
     'updateFavicon_(item_.url)',
   ],
 
   listeners: {
-    'mousedown': 'onMousedown_',
-    'blur': 'onItemBlur_',
     'click': 'onClick_',
     'dblclick': 'onDblClick_',
     'contextmenu': 'onContextMenu_',
   },
 
   /** @override */
   attached: function() {
     this.watch('item_', function(store) {
       return store.nodes[this.itemId];
     }.bind(this));
@@ skipping 61 matching lines @@
     assert(this.getState().nodes[this.itemId]);
     this.updateFromStore();
   },
 
   /** @private */
   onItemChanged_: function() {
     this.isFolder_ = !this.item_.url;
   },
 
   /**
-   * @private
-   */
-  onMousedown_: function() {
-    this.mouseFocus_ = true;
-  },
-
-  /**
-   * @private
-   */
-  onItemBlur_: function() {
-    this.mouseFocus_ = false;
-  },
-
-  /**
    * @param {MouseEvent} e
    * @private
    */
   onClick_: function(e) {
     // Ignore double clicks so that Ctrl double-clicking an item won't deselect
     // the item before opening.
     if (e.detail != 2) {
       this.dispatch(bookmarks.actions.selectItem(this.itemId, this.getState(), {
         clear: !e.ctrlKey,
         range: e.shiftKey,
@@ skipping 16 matching lines @@
   },
 
   /**
    * @param {string} url
    * @private
    */
   updateFavicon_: function(url) {
     this.$.icon.style.backgroundImage = cr.icon.getFavicon(url);
   },
 });