Add gear menu to /downloads and /external_storage.

chrome/browser/resources/file_manager/js/drive_banners.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.
 
 /**
  * Responsible for showing banners in the file list.
  * @param {DirectoryModel} directoryModel The model.
  * @param {VolumeManager} volumeManager The manager.
  * @param {DOMDocument} document HTML document.
  * @constructor
@@ skipping 516 matching lines @@
   learnMore.target = '_blank';
 };
 
 /**
  * Shows the panel when current directory is DRIVE and it's unmounted.
  * Hides it otherwise. The pannel shows spinner if DRIVE is mounting or
  * an error message if it failed.
  * @private
  */
 FileListBannerController.prototype.updateDriveUnmountedPanel_ = function() {
-  var node = this.document_.querySelector('.dialog-container');
+  var node = this.document_.querySelector('body');

[yoshiki, 2013/02/08 06:15:38]

You can use just "document.body".

   if (this.isOnDrive()) {
     var status = this.volumeManager_.getDriveStatus();
     if (status == VolumeManager.DriveStatus.MOUNTING ||
         status == VolumeManager.DriveStatus.ERROR) {
       this.ensureDriveUnmountedPanelInitialized_();
     }
     if (status == VolumeManager.DriveStatus.MOUNTING &&
         this.welcomeHeaderCounter_ == 0) {
       // Do not increment banner counter in order to not prevent the full
       // page banner of being shown (otherwise it would never be shown).
@@ skipping 26 matching lines @@
  * @param {Function} completeCallback To be called (may be directly) when
  *                                    this.newWelcome_ get ready.
  * @private
  */
 FileListBannerController.prototype.preparePromo_ = function(completeCallback) {
   if (this.newWelcome_ !== undefined)
     completeCallback();
   else
     (this.promoCallbacks_ = this.promoCallbacks_ || []).push(completeCallback);
 };