Files.app: Show drive sync state in the progress center.

chrome/browser/resources/file_manager/common/js/progress_center_common.js

 // Copyright 2013 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';
 
 /**
  * Event of the ProgressCenter class.
  * @enum {string}
  * @const
@@ skipping 29 matching lines @@
  */
 var ProgressItemType = Object.freeze({
   // The item is file copy operation.
   COPY: 'copy',
   // The item is file move operation.
   MOVE: 'move',
   // The item is file delete opeartion.
   DELETE: 'delete',
   // The item is file zip operation.
   ZIP: 'zip',
+  // The item is drive sync operaiton.
+  SYNC: 'sync',
   // The item is general file transfer operation.
   // This is used for the mixed operation of summarized item.
   TRANSFER: 'transfer'
 });
 
 /**
  * Item of the progress center.
  * @constructor
  */
 var ProgressCenterItem = function() {
@@ skipping 113 matching lines @@
   newItem.state = this.state;
   newItem.message = this.message;
   newItem.progressMax = this.progressMax;
   newItem.progressValue = this.progressValue;
   newItem.type = this.type;
   newItem.single = this.single;
   newItem.quiet = this.quiet;
   newItem.cancelCallback = this.cancelCallback;
   return newItem;
 };