Gallery.app: Fix image rotation in the image editor.

ui/file_manager/gallery/js/image_editor/image_encoder.js

 // Copyright 2014 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';
 
 /**
  * A namespace class for image encoding functions. All methods are static.
  */
 function ImageEncoder() {}
@@ skipping 14 matching lines @@
 
 /**
  * Create a metadata encoder.
  *
  * The encoder will own and modify a copy of the original metadata.
  *
  * @param {Object} metadata Original metadata.
  * @return {ImageEncoder.MetadataEncoder} Created metadata encoder.
  */
 ImageEncoder.createMetadataEncoder = function(metadata) {
-  var constructor = ImageEncoder.metadataEncoders[metadata.mimeType] ||
+  var constructor =
+      (metadata && ImageEncoder.metadataEncoders[metadata.mimeType]) ||
       ImageEncoder.MetadataEncoder;
   return new constructor(metadata);
 };
 
 
 /**
  * Create a metadata encoder object holding a copy of metadata
  * modified according to the properties of the supplied image.
  *
  * @param {Object} metadata Original metadata.
@@ skipping 155 matching lines @@
 };
 
 /**
  * @param {HTMLCanvasElement} canvas Canvas to use as thumbnail.
  * @param {number} quality Thumbnail quality.
  */
 ImageEncoder.MetadataEncoder.prototype.setThumbnailData =
     function(canvas, quality) {
   this.metadata_.thumbnailURL =
       canvas.toDataURL(this.metadata_.mimeType, quality);
+  delete this.metadata_.thumbnailTransform;
 };
 
 /**
  * Return a range where the metadata is (or should be) located.
  * @param {string} encodedImage // TODO(JSDOC).
  * @return {Object} An object with from and to properties.
  */
 ImageEncoder.MetadataEncoder.prototype.
-    findInsertionRange = function(encodedImage) { return {from: 0, to: 0} };
+    findInsertionRange = function(encodedImage) { return {from: 0, to: 0}; };
 
 /**
  * Return serialized metadata ready to write to an image file.
  * The return type is optimized for passing to Blob.append.
  * @return {ArrayBuffer} // TODO(JSDOC).
  */
 ImageEncoder.MetadataEncoder.prototype.encode = function() {
   return new Uint8Array(0).buffer;
 };