[Cleanup] Files.app: Add '@constructor' annotates to constructors.

chrome/browser/resources/file_manager/js/image_editor/image_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.
 
 /**
  * A namespace class for image encoding functions. All methods are static.
  */
 function ImageEncoder() {}
 
 //TODO(JSDOC)
@@ skipping 138 matching lines @@
   }
   return array.buffer;
 };
 
 /**
  * A base class for a metadata encoder.
  *
  * Serves as a default metadata encoder for images that none of the metadata
  * parsers recognized.
  *
+ * @constructor
  * @param {Object} original_metadata Starting metadata.
  */
 ImageEncoder.MetadataEncoder = function(original_metadata) {
   this.metadata_ = ImageUtil.deepCopy(original_metadata) || {};
   if (this.metadata_.mimeType != 'image/jpeg') {
     // Chrome can only encode JPEG and PNG. Force PNG mime type so that we
     // can save to file and generate a thumbnail.
     this.metadata_.mimeType = 'image/png';
   }
 };
@@ skipping 30 matching lines @@
     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;
 };