Show UI when a folder is empty.

ui/file_manager/file_manager/foreground/js/file_manager.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.
 
 /**
  * FileManager constructor.
  *
  * FileManager objects encapsulate the functionality of the file selector
  * dialogs, as well as the full screen file manager application (though the
  * latter is not yet implemented).
@@ skipping 168 matching lines @@
   this.gearMenuController_ = null;
 
   /**
    * Toolbar controller.
    * @type {ToolbarController}
    * @private
    */
   this.toolbarController_ = null;
 
   /**
+   * Empty folder controller.
+   * @private {EmptyFolderController}
+   */
+  this.emptyFolderController_ = null;
+
+  /**
    * App state controller.
    * @type {AppStateController}
    * @private
    */
   this.appStateController_ = null;
 
   /**
    * Dialog action controller.
    * @type {DialogActionController}
    * @private
@@ skipping 222 matching lines @@
         this.ui_.gearButton,
         this.ui_.gearMenu,
         this.directoryModel_,
         this.commandHandler);
     this.toolbarController_ = new ToolbarController(
         this.ui_.toolbar,
         this.ui_.dialogNavigationList,
         assert(this.ui_.locationLine),
         this.selectionHandler_,
         this.directoryModel_);
+    this.emptyFolderController_ = new EmptyFolderController(
+        this.ui_.emptyFolder,
+        this.directoryModel_);
 
     importer.importEnabled().then(
         function(enabled) {
           if (enabled) {
             this.importController_ = new importer.ImportController(
                 new importer.RuntimeControllerEnvironment(
                     this,
                     this.selectionHandler_),
                 this.mediaScanner_,
                 this.mediaImportHandler_,
@@ skipping 859 matching lines @@
       out += this.initializeQueue_.pendingTasks[key].toString() + '\n';
     }.bind(this));
 
     out += '2. VolumeManagerWrapper\n' +
         this.volumeManager_.toString() + '\n';
 
     out += 'End of debug information.';
     console.log(out);
   };
 })();