Add type annotations to gallery/js/image_editor/image_view.js.

ui/file_manager/gallery/js/gallery_item.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.
 
 /**
  * Object representing an image item (a photo).
  *
  * @param {!FileEntry} entry Image entry.
  * @param {!EntryLocation} locationInfo Entry location information.
  * @param {!Object} metadata Metadata for the entry.
@@ skipping 28 matching lines @@
    * @const
    */
   this.metadataCache_ = metadataCache;
 
   // TODO(yawano): Change this.contentImage and this.screenImage to private
   // fields and provide utility methods for them (e.g. revokeFullImageCache).
   /**
    * The content cache is used for prefetching the next image when going through
    * the images sequentially. The real life photos can be large (18Mpix = 72Mb
    * pixel array) so we want only the minimum amount of caching.
-   * @type {HTMLCanvasElement}
+   * @type {(HTMLCanvasElement|HTMLImageElement)}
    */
   this.contentImage = null;
 
   /**
    * We reuse previously generated screen-scale images so that going back to a
    * recently loaded image looks instant even if the image is not in the content
    * cache any more. Screen-scale images are small (~1Mpix) so we can afford to
    * cache more of them.
    * @type {HTMLCanvasElement}
    */
@@ skipping 294 matching lines @@
         return Promise.reject(str('GALLERY_FILE_EXISTS'));
       }, function() {
         return new Promise(
             this.entry_.moveTo.bind(this.entry_, parentDirectory, newFileName));
       }.bind(this));
     }.bind(this));
   }.bind(this)).then(function(entry) {
     this.entry_ = entry;
   }.bind(this));
 };