[filebrowser] More reliable file saving in Photo Editor

chrome/browser/resources/file_manager/js/metadata_parser.js

 // Copyright (c) 2011 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.
 
-function MetadataParser(parent) {
+function MetadataParser(parent, type, urlFilter) {
   this.parent_ = parent;
+  this.type = type;
+  this.urlFilter = urlFilter;
   this.verbose = parent.verbose;
 }
 
 MetadataParser.prototype.error = function(var_args) {
   this.parent_.error.apply(this.parent_, arguments);
 };
 
 MetadataParser.prototype.log = function(var_args) {
   this.parent_.log.apply(this.parent_, arguments);
 };
 
 MetadataParser.prototype.vlog = function(var_args) {
   if (this.verbose)
     this.parent_.log.apply(this.parent_, arguments);
 };
+
+MetadataParser.prototype.createDefaultMetadata = function() { return {} };
+
+MetadataParser.prototype.acceptsMimeType = function(mimeType) { return false };
+
+
+/* Base class for image metadata parsers */
+function ImageParser(parent, type, urlFilter) {
+  MetadataParser.apply(this, arguments);
+  this.mimeType = 'image/' + this.type;
+}
+
+ImageParser.prototype = {__proto__: MetadataParser.prototype};
+
+ImageParser.prototype.createDefaultMetadata = function() {
+  return { mimeType: this.mimeType };
+};
+
+ImageParser.prototype.acceptsMimeType = function(mimeType) {
+  return mimeType == this.mimeType;
+}
+