Add gear menu to /downloads and /external_storage.

chrome/browser/resources/file_manager/js/file_manager_commands.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.
 
 var CommandUtil = {};
 
 /**
  * Extracts root on which command event was dispatched.
  *
  * @param {Event} event Command event for which to retrieve root to operate on.
@@ skipping 17 matching lines @@
   var root = CommandUtil.getCommandRoot(event, rootsList);
 
   return root && PathUtil.getRootType(root.fullPath);
 };
 
 /**
  * Checks if command can be executed on drive.
  * @param {Event} event Command event to mark.
  * @param {FileManager} fileManager FileManager to use.
  */
-CommandUtil.canExecuteOnDriveOnly = function(event, fileManager) {
+CommandUtil.canExecuteEnabledOnDriveOnly = function(event, fileManager) {
   event.canExecute = fileManager.isOnDrive();
 };
 
 /**
+ * Checks if command should be visible on drive.
+ * @param {Event} event Command event to mark.
+ * @param {FileManager} fileManager FileManager to use.
+ */
+CommandUtil.canExecuteVisibleOnDriveOnly = function(event, fileManager) {
+  event.canExecute = fileManager.isOnDrive();
+  event.command.setHidden(!fileManager.isOnDrive());
+};
+
+/**
  * Returns a single selected/passed entry or null.
  * @param {Event} event Command event.
  * @param {FileManager} fileManager FileManager to use.
  * @return {FileEntry} The entry or null.
  */
 CommandUtil.getSingleEntry = function(event, fileManager) {
   if (event.target.entry) {
     return event.target.entry;
   }
   var selection = fileManager.getSelection();
@@ skipping 186 matching lines @@
         !fileManager.isRenamingInProgress() &&
         !fileManager.isOnReadonlyDirectory() &&
         selection &&
         selection.totalCount == 1;
   }
 };
 
 /**
  * Opens drive help.
  */
-Commands.driveHelpCommand = {
+Commands.volumeHelpCommand = {
   execute: function() {
-    window.open(FileManager.GOOGLE_DRIVE_HELP, 'help');
+    if (fileManager.isOnDrive())
+      window.open(FileManager.GOOGLE_DRIVE_HELP, 'help');
+    else
+      window.open(FileManager.FILES_APP_HELP, 'help');
   },
-  canExecute: CommandUtil.canExecuteOnDriveOnly
+  canExecute: function(event, fileManager) {
+    event.canExecute = true;
+  }
 };
 
 /**
  * Opens drive buy-more-space url.
  */
 Commands.driveBuySpaceCommand = {
   execute: function() {
     window.open(FileManager.GOOGLE_DRIVE_BUY_STORAGE, 'buy-more-space');
   },
-  canExecute: CommandUtil.canExecuteOnDriveOnly
+  canExecute: CommandUtil.canExecuteVisibleOnDriveOnly
 };
 
 /**
  * Clears drive cache.
  */
 Commands.driveClearCacheCommand = {
   execute: function() {
     chrome.fileBrowserPrivate.clearDriveCache();
   },
-  canExecute: CommandUtil.canExecuteOnDriveOnly
+  canExecute: CommandUtil.canExecuteVisibleOnDriveOnly
 };
 
 /**
  * Reload the metadata of the file system from the server
  */
 Commands.driveReloadCommand = {
   execute: function() {
     chrome.fileBrowserPrivate.reloadDrive();
   },
-  canExecute: CommandUtil.canExecuteOnDriveOnly
+  canExecute: CommandUtil.canExecuteVisibleOnDriveOnly
 };
 
 /**
  * Opens drive.google.com.
  */
 Commands.driveGoToDriveCommand = {
   execute: function() {
     window.open(FileManager.GOOGLE_DRIVE_ROOT, 'drive-root');
   },
-  canExecute: CommandUtil.canExecuteOnDriveOnly
+  canExecute: CommandUtil.canExecuteVisibleOnDriveOnly
 };
 
 /**
  * Displays open with dialog for current selection.
  */
 Commands.openWithCommand = {
   execute: function(event, fileManager) {
     var tasks = fileManager.getSelection().tasks;
     if (tasks) {
       tasks.showTaskPicker(fileManager.defaultTaskPicker,
@@ skipping 90 matching lines @@
  * Opens Files App help.
  */
 Commands.filesAppHelpCommand = {
   execute: function() {
     window.open(FileManager.FILES_APP_HELP, 'help');
   },
   canExecute: function(event, fileManager) {
     event.canExecute = true;
   }
 };