Compile more Gallery targets in gyp v2.

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.
 
 /**
  * Overrided metadata worker's path.
  * @type {string}
  */
 ContentMetadataProvider.WORKER_SCRIPT = '/js/metadata_worker.js';
 
@@ skipping 90 matching lines @@
       this.onFilenameEditBlur_.bind(this));
   this.filenameEdit_.addEventListener('focus',
       this.onFilenameFocus_.bind(this));
   this.filenameEdit_.addEventListener('input',
       this.resizeRenameField_.bind(this));
   this.filenameEdit_.addEventListener('keydown',
       this.onFilenameEditKeydown_.bind(this));
 
   var buttonSpacer = queryRequiredElement('.button-spacer', this.topToolbar_);
 
-  this.prompt_ = new ImageEditor.Prompt(this.container_, strf);
+  this.prompt_ = new ImageEditorPrompt(this.container_, strf);
 
   this.errorBanner_ = new ErrorBanner(this.container_);
 
   /**
    * @private {!HTMLElement}
    * @const
    */
   this.modeSwitchButton_ = queryRequiredElement('button.mode',
       this.topToolbar_);
   GalleryUtil.decorateMouseFocusHandling(this.modeSwitchButton_);
@@ skipping 921 matching lines @@
  */
 var initializePromise =
     Promise.all([loadTimeDataPromise, volumeManagerPromise]).
     then(function(args) {
       var volumeManager = args[1];
       gallery = new Gallery(volumeManager);
     });
 
 // Loads entries.
 initializePromise.then(reload);