[Cleanup] Files.app: add '@return' annotations

chrome/browser/resources/file_manager/js/metadata/id3_parser.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.
 
 importScripts('function_sequence.js');
 importScripts('function_parallel.js');
 
 function Id3Parser(parent) {
   MetadataParser.call(this, parent, 'id3', /\.(mp3)$/i);
 }
@@ skipping 37 matching lines @@
   return reader.readScalar(2, false) << 16 | reader.readScalar(1, false);
 };
 
 /**
  * Reads string from reader with specified encoding
  *
  * @private
  * @param {ByteReader} reader reader to use.
  * @param {int} encoding string encoding.
  * @param {int} size maximum string size. Actual result may be shorter.
+ * @return {string}  // TODO(JSDOC).
  */
 Id3Parser.prototype.readString_ = function(reader, encoding, size) {
   switch (encoding) {
     case Id3Parser.v2.ENCODING.ISO_8859_1:
       return reader.readNullTerminatedString(size);
 
     case Id3Parser.v2.ENCODING.UTF_16:
       return reader.readNullTerminatedStringUTF16(true, size);
 
     case Id3Parser.v2.ENCODING.UTF_16BE:
@@ skipping 626 matching lines @@
     TYER: 'ID3_YEAR',
     WCOP: 'ID3_COPYRIGHT',
     WOAF: 'ID3_OFFICIAL_AUDIO_FILE_WEBPAGE',
     WOAR: 'ID3_OFFICIAL_ARTIST',
     WOAS: 'ID3_OFFICIAL_AUDIO_SOURCE_WEBPAGE',
     WPUB: 'ID3_PUBLISHERS_OFFICIAL_WEBPAGE'
   }
 };
 
 MetadataDispatcher.registerParserClass(Id3Parser);