Files.app: Let the thumbnail images in the preview panels managed by PreviewPanel class.

chrome/browser/resources/file_manager/js/file_manager.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.
 
 'use strict';
 
 /**
  * This variable is checked in SelectFileDialogExtensionBrowserTest.
  * @type {number}
  */
@@ skipping 836 matching lines @@
 
     var fullPage = this.dialogType == DialogType.FULL_PAGE;
     FileTable.decorate(this.table_, this.metadataCache_, fullPage);
     FileGrid.decorate(this.grid_, this.metadataCache_);
 
     this.previewPanel_ = new PreviewPanel(
         dom.querySelector('.preview-panel'),
         DialogType.isOpenDialog(this.dialogType) ?
             PreviewPanel.VisibilityType.ALWAYS_VISIBLE :
             PreviewPanel.VisibilityType.AUTO,
-        this.getCurrentDirectory());
+        this.getCurrentDirectory(),
+        this.metadataCache_);
     this.previewPanel_.addEventListener(
         PreviewPanel.Event.VISIBILITY_CHANGE,
         this.onPreviewPanelVisibilityChange_.bind(this));
     this.previewPanel_.initialize();
 
     this.document_.addEventListener('keydown', this.onKeyDown_.bind(this));
     this.document_.addEventListener('keyup', this.onKeyUp_.bind(this));
 
     // This capturing event is only used to distinguish focusing using
     // keyboard from focusing using mouse.
@@ skipping 3070 matching lines @@
    */
   FileManager.prototype.setCtrlKeyPressed_ = function(flag) {
     this.ctrlKeyPressed_ = flag;
     // Before the DOM is constructed, the key event can be handled.
     var cacheClearCommand =
         this.document_.querySelector('#drive-clear-local-cache');
     if (cacheClearCommand)
       cacheClearCommand.canExecuteChange();
   };
 })();