Enable rar, tar, tar.gz and tar.bz2 archive support in CrOS file manager.

chrome/browser/resources/file_manager/js/file_type.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.
 
 /**
  * Namespace object for file type utility functions.
  */
 var FileType = {};
 
 FileType.types = {
@@ skipping 30 matching lines @@
   'wav':  {type: 'audio', name: 'AUDIO_FILE_TYPE', subtype: 'WAV'},
 
   // Text
   'pod': {type: 'text', name: 'PLAIN_TEXT_FILE_TYPE', subtype: 'POD'},
   'rst': {type: 'text', name: 'PLAIN_TEXT_FILE_TYPE', subtype: 'RST'},
   'txt': {type: 'text', name: 'PLAIN_TEXT_FILE_TYPE', subtype: 'TXT'},
   'log': {type: 'text', name: 'PLAIN_TEXT_FILE_TYPE', subtype: 'LOG'},
 
   // Others
   'zip': {type: 'archive', name: 'ZIP_ARCHIVE_FILE_TYPE'},
+  'rar': {type: 'archive', name: 'RAR_ARCHIVE_FILE_TYPE'},
+  'tar': {type: 'archive', name: 'TAR_ARCHIVE_FILE_TYPE'},
+  'tar.bz2': {type: 'archive', name: 'TAR_BZIP2_ARCHIVE_FILE_TYPE'},
+  'tbz': {type: 'archive', name: 'TAR_BZIP2_ARCHIVE_FILE_TYPE'},
+  'tbz2': {type: 'archive', name: 'TAR_BZIP2_ARCHIVE_FILE_TYPE'},
+  'tar.gz': {type: 'archive', name: 'TAR_GZIP_ARCHIVE_FILE_TYPE'},
+  'tgz': {type: 'archive', name: 'TAR_GZIP_ARCHIVE_FILE_TYPE'},
 
   'pdf': {type: 'text', icon: 'pdf', name: 'PDF_DOCUMENT_FILE_TYPE',
           subtype: 'PDF'},
   'html': {type: 'text', icon: 'html', name: 'HTML_DOCUMENT_FILE_TYPE',
            subtype: 'HTML'},
   'htm': {type: 'text', icon: 'html', name: 'HTML_DOCUMENT_FILE_TYPE',
           subtype: 'HTML'}
 };
 
 FileType.previewArt = {
@@ skipping 57 matching lines @@
  * @param {number} opt_size The file size to be used if the metadata does not
  *   contain fileSize.
  * @return {boolean} Whether it is OK to use the image url for a preview.
  */
 FileType.canUseImageUrlForPreview = function(metadata, opt_size) {
   var fileSize = metadata.fileSize || opt_size;
   return ((fileSize && fileSize <= FileType.MAX_PREVIEW_FILE_SIZE)  ||
       (metadata.width && metadata.height &&
       (metadata.width * metadata.height <= FileType.MAX_PREVIEW_PIXEL_COUNT)));
 };