Add script files of the separated Gallery.app.

ui/file_manager/gallery/js/image_editor/exif_encoder.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';
 
 // TODO:(kaznacheev) Share the EXIF constants with exif_parser.js
 var EXIF_MARK_SOS = 0xffda;  // Start of "stream" (the actual image data).
 var EXIF_MARK_SOI = 0xffd8;  // Start of image data.
 var EXIF_MARK_EOI = 0xffd9;  // End of image data.
@@ skipping 549 matching lines @@
 };
 
 /**
  * Check if every forward has been resolved, throw and error if not.
  */
 ByteWriter.prototype.checkResolved = function() {
   for (var key in this.forwards_) {
     throw new Error('Unresolved forward pointer ' + key.toString(16));
   }
 };