Tweaks for improving file manager performance

chrome/browser/resources/shared/js/cr/ui/table.js

 // Copyright (c) 2012 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.
 
 /**
  * @fileoverview This implements a table control.
  */
 
 cr.define('cr.ui', function() {
   const ListSelectionModel = cr.ui.ListSelectionModel;
@@ skipping 186 matching lines @@
     },
 
     /**
      * Redraws the table.
      */
     redraw: function(index) {
       this.list_.redraw();
       this.header_.redraw();
     },
 
+    startBatchUpdates: function() {
+      this.list_.startBatchUpdates();
+      this.header_.startBatchUpdates();
+    },
+
+    endBatchUpdates: function() {
+      this.list_.endBatchUpdates();
+      this.header_.endBatchUpdates();
+    },
+
     /**
      * Resize the table columns.
      */
     resize: function() {
       // We resize columns only instead of full redraw.
       this.list_.resize();
       this.header_.resize();
     },
 
     /**
@@ skipping 92 matching lines @@
    * because table contents can contain controls that can be focused, and for
    * some purposes (e.g., styling), the table can still be conceptually focused
    * at that point even though it doesn't actually have the page focus.
    */
   cr.defineProperty(Table, 'hasElementFocus', cr.PropertyKind.BOOL_ATTR);
 
   return {
     Table: Table
   };
 });