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

chrome/browser/resources/file_manager/js/file_manager.js

Index: chrome/browser/resources/file_manager/js/file_manager.js
diff --git a/chrome/browser/resources/file_manager/js/file_manager.js b/chrome/browser/resources/file_manager/js/file_manager.js
index afb33444b9994710c49ff5433d5e0dbfb98c4429..f3d3089290971b5ceff6ec536172d9906766c8b8 100644
--- a/chrome/browser/resources/file_manager/js/file_manager.js
+++ b/chrome/browser/resources/file_manager/js/file_manager.js
@@ -854,7 +854,8 @@ var BOTTOM_MARGIN_FOR_PREVIEW_PANEL_PX = 52;
         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));