drive: Use "/drive/root" namespace and fix Files app and tests.

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.
 
 'use strict';
 
 /**
  * Type of a root directory.
  * @enum
  */
@@ skipping 115 matching lines @@
 };
 
 /**
  * @param {string} path Any path.
  * @return {string} The root path.
  */
 PathUtil.getRootPath = function(path) {
   var type = PathUtil.getRootType(path);
 
   // TODO(haruki): Add support for "drive/root" and "drive/other".
-  if (type == RootType.DOWNLOADS || type == RootType.DRIVE ||
-      type == RootType.DRIVE_OFFLINE || type == RootType.DRIVE_SHARED_WITH_ME)
+  if (type == RootType.DOWNLOADS || type == RootType.DRIVE_OFFLINE ||
+      type == RootType.DRIVE_SHARED_WITH_ME)
     return PathUtil.getTopDirectory(path);
 
-  if (type == RootType.ARCHIVE ||
+  if (type == RootType.DRIVE || type == RootType.ARCHIVE ||
       type == RootType.REMOVABLE) {
     var components = PathUtil.split(path);
     if (components.length > 1) {
       return PathUtil.join(components[0], components[1]);
     } else {
       return components[0];
     }
   }
 
   return '/';
@@ skipping 55 matching lines @@
     return str('ARCHIVE_DIRECTORY_LABEL');
   if (PathUtil.isParentPath(RootDirectory.ARCHIVE, path))
     return path.substring(RootDirectory.ARCHIVE.length + 1);
 
   if (path === RootDirectory.REMOVABLE)
     return str('REMOVABLE_DIRECTORY_LABEL');
   if (PathUtil.isParentPath(RootDirectory.REMOVABLE, path))
     return path.substring(RootDirectory.REMOVABLE.length + 1);
 
   // TODO(haruki): Add support for "drive/root" and "drive/other".
-  if (path === RootDirectory.DRIVE)
+  if (path === RootDirectory.DRIVE + '/' + DriveSubRootDirectory.ROOT)
     return str('DRIVE_DIRECTORY_LABEL');
 
   if (path === RootDirectory.DRIVE_OFFLINE)
     return str('DRIVE_OFFLINE_COLLECTION_LABEL');
 
   if (path === RootDirectory.DRIVE_SHARED_WITH_ME)
     return str('DRIVE_SHARED_WITH_ME_COLLECTION_LABEL');
 
   return path;
 };