Made the visibility of Buttom bar updated at the end of drag selection.

chrome/browser/resources/file_manager/js/drag_selector.js

 // Copyright 2013 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.
 
 'use strict';
 
 /**
  * Drag selector used on the file list or the grid table.
  * TODO(hirono): Support drag selection for grid view. crbug.com/224832
  * @constructor
@@ skipping 220 matching lines @@
  * @private
  * @param {MouseEvent} event The mouseup event.
  */
 DragSelector.prototype.onMouseUp_ = function(event) {
   this.onMouseMove_(event);
   this.target_.removeChild(this.border_);
   this.target_.ownerDocument.removeEventListener(
       'mousemove', this.onMouseMoveBound_, true);
   this.target_.ownerDocument.removeEventListener(
       'mouseup', this.onMouseUpBound_, true);
+  this.target_.dispatchEvent(new Event('dragselectionend'));

[yoshiki, 2013/06/20 03:11:25]

Is it possible to use cr.dispatchSimpleEvent(this.target_, 'dragselectionend')
instead? It's common way in Files.app.

[hirono, 2013/06/20 03:55:03]

Done.

   this.target_.cachedBounds = null;
+  this.target_ = null;
+  // The target may select an item by reacting to the mouseup event.
+  // This surpress to the selecting behavior.
   event.stopPropagation();
-  this.target_ = null;
 };