Show a local folder's size in QuickView.

ui/file_manager/file_manager/foreground/elements/files_metadata_entry.js

 // Copyright 2016 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.
 
 var FilesMetadataBox = Polymer({
   is: 'files-metadata-entry',
 
   properties: {
     key: {
       type: String,
       reflectToAttribtue: true,
     },
 
     // If |value| is empty, the entire entry will be hidden.
     value: {
       type: String,
       reflectToAttribtue: true,
     },
+
+    loading: {
+      type: Boolean,
+      reflectToAttribtue: true,
+      value: false,
+    },
   },
 
+  /**
+   * @param {boolean} loading
+   * @return {string} calssName for loading if loading is true.
+   */
+  setLoadingClass: function(loading) {

[fukino, 2016/09/06 09:12:45]

This function looks unnecessary.

[harukam, 2016/09/06 11:25:24]

Acknowledged.

+    return loading ? "loading" : "";
+  },
 });