Cancel scans when directory changed.

ui/file_manager/file_manager/common/js/importer_common.js

 // Copyright 2014 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.
 
 // Shared cloud importer namespace
 var importer = importer || {};
 
 /** @enum {string} */
 importer.ScanEvent = {
   FINALIZED: 'finalized',
@@ skipping 326 matching lines @@
  *     relatively unique to this machine (among a users machines).
  */
 importer.getMachineId = function() {
   var storage = importer.ChromeLocalStorage.getInstance();
   return storage.get(importer.Setting.MACHINE_ID)
       .then(
           function(id) {
             if (id) {
               return id;
             }
-            var id = importer.generateMachineId_();
+            var id = importer.generateId();
             return storage.set(importer.Setting.MACHINE_ID, id)
                 .then(
                     function() {
                       return id;
                     });
           });
 };
 
 /**
  * @return {!Promise<string>} Resolves with the filename of this
@@ skipping 12 matching lines @@
  *     machines debug log file.
  */
 importer.getDebugLogFilename = function(logId) {
   return importer.getMachineId().then(
       function(machineId) {
         return machineId + '-import-debug-' + logId + '.log';
       });
 };
 
 /**
- * @return {number} A relatively unique six digit integer that is most likely
- *     unique to this machine among a user's machines. Used only to segregate
- *     log files on sync storage.
+ * @return {number} A relatively random six digit integer.
  */
-importer.generateMachineId_ = function() {
+importer.generateId = function() {
   return Math.floor(Math.random() * 899999) + 100000;
 };
 
 /**
  * @param {number} machineId The machine id for *this* machine. All returned
  *     files will have machine ids NOT matching this.
  * @return {!Promise<!FileEntry>} all history files not having
  *     a machine id matching {@code machineId}.
  * @private
  */
@@ skipping 696 matching lines @@
       });
 };
 
 /** @private @const {!importer.ChromeLocalStorage} */
 importer.ChromeLocalStorage.INSTANCE_ = new importer.ChromeLocalStorage();
 
 /** @return {!importer.ChromeLocalStorage} */
 importer.ChromeLocalStorage.getInstance = function() {
   return importer.ChromeLocalStorage.INSTANCE_;
 };