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

chrome/browser/resources/file_manager/background/js/background.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';
 
 /**
  * Number of runtime errors catched in the background page.
  * @type {number}
  */
@@ skipping 51 matching lines @@
   this.fileOperationHandler_ = new FileOperationHandler(this);
 
   /**
    * Event handler for C++ sides notifications.
    * @type {DeviceHandler}
    * @private
    */
   this.deviceHandler_ = new DeviceHandler();
 
   /**
+   * Drive sync handler.
+   * @type {DriveSyncHandler}
+   * @private
+   */
+  this.driveSyncHandler_ = new DriveSyncHandler(this.progressCenter);
+  this.driveSyncHandler_.addEventListener(
+      DriveSyncHandler.COMPLETED_EVENT,
+      function() { this.tryClose(); }.bind(this));
+
+  /**
    * String assets.
    * @type {Object.<string, string>}
    */
   this.stringData = null;
 
   /**
    * Callback list to be invoked after initialization.
    * It turns to null after initialization.
    *
    * @type {Array.<function()>}
@@ skipping 67 matching lines @@
     this.initializeCallbacks_.push(callback);
   else
     callback();
 };
 
 /**
  * Checks the current condition of background page and closes it if possible.
  */
 Background.prototype.tryClose = function() {
   // If the file operation is going, the background page cannot close.
-  if (this.fileOperationManager.hasQueuedTasks()) {
+  if (this.fileOperationManager.hasQueuedTasks() ||
+      this.driveSyncHandler_.syncing) {
     this.lastTimeCanClose_ = null;
     return;
   }
 
   var views = chrome.extension.getViews();
   var closing = false;
   for (var i = 0; i < views.length; i++) {
     // If the window that is not the background page itself and it is not
     // closing, the background page cannot close.
     if (views[i] !== window && !views[i].closing) {
@@ skipping 615 matching lines @@
     contexts: ['launcher'],
     title: str('NEW_WINDOW_BUTTON_LABEL')
   });
 };
 
 /**
  * Singleton instance of Background.
  * @type {Background}
  */
 window.background = new Background();