[NOT FOR COMMIT] Use chrome://gdata in Photo Editor

chrome/browser/resources/file_manager/js/metadata/metadata_provider.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 base class for metadata provider. Implementing in-memory caching.
  */
 function MetadataCache() {
   this.cache_ = {};
 }
@@ skipping 202 matching lines @@
 }
 
 GDataMetadataFetcher.prototype = { __proto__: MetadataFetcher.prototype };
 
 GDataMetadataFetcher.prototype.doFetch = function(url) {
   function convertMetadata(result) {
     return {
       remote: true,
       thumbnailURL: result.thumbnailUrl,
       contentURL: (result.contentUrl || '').replace(/\?.*$/gi, ''),
+      cachedURL: result.editUrl,
       fileSize: 0  // TODO(kaznacheev) Get the correct size from File API.
     }
   }
 
   chrome.fileBrowserPrivate.getGDataFileProperties([url],
     function(results) {
       this.processResult(url, convertMetadata(results[0]));
     }.bind(this));
 };
 
@@ skipping 46 matching lines @@
 MetadataProvider.prototype.fetchLocal = function(url, callback) {
   this.fetch(url, function(metadata) {
     if (metadata.remote) {
       delete metadata.remote;
       this.fetch(url, callback, [this.local_]);
     } else {
       callback(metadata);
     }
   }.bind(this));
 };