Use resolveIsolatedEntries in the separated new Gallery.app.

ui/file_manager/gallery/js/gallery.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';
 
 /**
  * Called from the main frame when unloading.
  * @param {boolean=} opt_exiting True if the app is exiting.
  */
@@ skipping 869 matching lines @@
 Gallery.prototype.updateButtons_ = function() {
   if (this.modeButton_) {
     var oppositeMode =
         this.currentMode_ === this.slideMode_ ? this.mosaicMode_ :
                                                 this.slideMode_;
     this.modeButton_.title = str(oppositeMode.getTitle());
   }
 };
 
 window.addEventListener('load', function() {
-  var entries = window.launchData.items.map(
-      function(item) { return item.entry; });
-  window.backgroundComponent.
-      then(function(inBackgroundComponent) {
-        window.loadTimeData.data = inBackgroundComponent.stringData;
-        var gallery = new Gallery(inBackgroundComponent.volumeManager);
-        gallery.load(entries, entries);
-      }).
-      catch(function(error) {
-        console.error(error.stack || error);
-      });
+  Promise.all([
+    window.backgroundComponentsPromise,
+    window.launchData.entriesPromise
+  ]).then(function(args) {
+    var backgroundComponents = args[0];
+    var entries = args[1];
+    window.loadTimeData.data = backgroundComponents.stringData;
+    var gallery = new Gallery(backgroundComponents.volumeManager);
+    gallery.load(entries.allEntries, entries.selectedEntries);
+  }).catch(function(error) {
+    console.error(error.stack || error);
+  });
 });