Show UI when a folder is empty.

ui/file_manager/file_manager/foreground/js/ui/empty_folder.js

Index: ui/file_manager/file_manager/foreground/js/ui/empty_folder.js
diff --git a/ui/file_manager/file_manager/foreground/js/ui/empty_folder.js b/ui/file_manager/file_manager/foreground/js/ui/empty_folder.js
new file mode 100644
index 0000000000000000000000000000000000000000..7972f96c5e89b2b44752c8146238f6f6bd2c06b4
--- /dev/null
+++ b/ui/file_manager/file_manager/foreground/js/ui/empty_folder.js
@@ -0,0 +1,30 @@
+// Copyright 2015 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.
+
+/**
+ * Empty folder UI.
+ * @param {!HTMLElement} emptyFolder DOM element of empty folder.
+ * @constructor
+ * @struct
+ */
+function EmptyFolder(emptyFolder) {
+  /**
+   * @private {!HTMLElement}
+   */
+  this.emptyFolder_ = emptyFolder;
+}
+
+/**
+ * Shows empty folder UI.
+ */
+EmptyFolder.prototype.show = function() {
+  this.emptyFolder_.hidden = false;
+};
+
+/**
+ * Hides empty folder UI.
+ */
+EmptyFolder.prototype.hide = function() {
+  this.emptyFolder_.hidden = true;
+};