Files.app: Add subfolders in the left nav

chrome/browser/resources/file_manager/js/path_util.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.
 
 /**
  * Type of a root directory.
  * @enum
  */
 var RootType = {
   DOWNLOADS: 'downloads',
@@ skipping 113 matching lines @@
 
 /**
  * @param {string} path A path.
  * @return {boolean} True if it is a path to the root.
  */
 PathUtil.isRootPath = function(path) {
   return PathUtil.getRootPath(path) === path;
 };
 
 /**
+ * @param {string} path A root path.
+ * @return {boolean} True if the given path is root and user can unmount it.
+ */
+PathUtil.isUnmountableByUser = function(path) {
+  if (!PathUtil.isRootPath(path))
+    return false;
+
+  var type = PathUtil.getRootType(path);
+  return (type == RootType.ARCHIVE || type == RootType.REMOVABLE);
+};
+
+/**
  * @param {string} parent_path The parent path.
  * @param {string} child_path The child path.
  * @return {boolean} True if |parent_path| is parent file path of |child_path|.
  */
 PathUtil.isParentPath = function(parent_path, child_path) {
   if (!parent_path || parent_path.length == 0 ||
       !child_path || child_path.length == 0)
     return false;
 
   if (parent_path[parent_path.length - 1] != '/')
@@ skipping 29 matching lines @@
     return path.substring(RootDirectory.REMOVABLE.length + 1);
 
   if (path === RootDirectory.DRIVE)
     return str('DRIVE_DIRECTORY_LABEL');
 
   if (path === RootDirectory.DRIVE_OFFLINE)
     return str('DRIVE_OFFLINE_COLLECTION_LABEL');
 
   return path;
 };