Compile several targets in Gallery 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 210 matching lines @@
 
   chrome.accessibilityFeatures.highContrast.onChange.addListener(
       this.onGetOrChangedAccessibilityConfiguration_.bind(
           this, 'high-contrast'));
   chrome.accessibilityFeatures.highContrast.get({},
       this.onGetOrChangedAccessibilityConfiguration_.bind(
           this, 'high-contrast'));
 }
 
 /**
- * Tools fade-out timeout in milliseconds.
- * @const
- * @type {number}
- */
-Gallery.FADE_TIMEOUT = 2000;
-
-/**
  * First time tools fade-out timeout in milliseconds.
  * @const
  * @type {number}
  */
 Gallery.FIRST_FADE_TIMEOUT = 1000;
 
 /**
  * Time until mosaic is initialized in the background. Used to make gallery
  * in the slide mode load faster. In milliseconds.
  * @const
  * @type {number}
  */
 Gallery.MOSAIC_BACKGROUND_INIT_DELAY = 1000;
 
 /**
- * Types of metadata Gallery uses (to query the metadata cache).
- * @const
- * @type {!Array<string>}
- */
-Gallery.PREFETCH_PROPERTY_NAMES =
-    ['imageWidth', 'imageHeight', 'imageRotation', 'size', 'present'];
-
-/**
  * Modes in Gallery.
  * @enum {string}
  */
 Gallery.Mode = {
   SLIDE: 'slide',
   THUMBNAIL: 'thumbnail'
 };
 
 /**
  * Sub modes in Gallery.
@@ skipping 117 matching lines @@
   // Use the self variable capture-by-closure because it is faster than bind.
   var self = this;
   var thumbnailModel = new ThumbnailModel(this.metadataModel_);
   var loadNext = function(index) {
     // Extract chunk.
     if (index >= items.length)
       return;
     var item = items[index];
     var entry = item.getEntry();
     var metadataPromise = self.metadataModel_.get([entry],
-        Gallery.PREFETCH_PROPERTY_NAMES);
+        GalleryItem.PREFETCH_PROPERTY_NAMES);
     var thumbnailPromise = thumbnailModel.get([entry]);
     return Promise.all([metadataPromise, thumbnailPromise]).then(
         function(metadataLists) {
       // Add items to the model.
       item.setMetadataItem(metadataLists[0][0]);
       item.setThumbnailMetadataItem(metadataLists[1][0]);
 
       var event = new Event('content');
       event.item = item;
       event.oldEntry = entry;
@@ skipping 665 matching lines @@
  */
 var initializePromise =
     Promise.all([loadTimeDataPromise, volumeManagerPromise]).
     then(function(args) {
       var volumeManager = args[1];
       gallery = new Gallery(volumeManager);
     });
 
 // Loads entries.
 initializePromise.then(reload);