Files.app: Reland r261616: Add a test to rename a file.

chrome/browser/resources/file_manager/foreground/js/file_manager.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';
 
 /**
  * FileManager constructor.
  *
  * FileManager objects encapsulate the functionality of the file selector
@@ skipping 2462 matching lines @@
   FileManager.prototype.commitRename_ = function() {
     var input = this.renameInput_;
     var entry = input.currentEntry;
     var newName = input.value;
 
     if (newName == entry.name) {
       this.cancelRename_();
       return;
     }
 
-    var nameNode = this.findListItemForNode_(this.renameInput_).
-                   querySelector('.filename-label');
+    var renamedItemElement = this.findListItemForNode_(this.renameInput_);
+    var nameNode = renamedItemElement.querySelector('.filename-label');
 
     input.validation_ = true;
     var validationDone = function(valid) {
       input.validation_ = false;
       // Alert dialog restores focus unless the item removed from DOM.
       if (this.document_.activeElement != input)
         this.cancelRename_();
       if (!valid)
         return;
 
       // Validation succeeded. Do renaming.
 
       this.cancelRename_();
       // Optimistically apply new name immediately to avoid flickering in
       // case of success.
       nameNode.textContent = newName;
+      // Add a marker of the provisional change for test cases.
+      renamedItemElement.classList.add('provisional');
 
       util.rename(
           entry, newName,
           function(newEntry) {
             this.directoryModel_.onRenameEntry(entry, newEntry);
+            renamedItemElement.classList.remove('provisional');
           }.bind(this),
           function(error) {
             // Write back to the old name.
             nameNode.textContent = entry.name;
+            renamedItemElement.classList.remove('provisional');
 
             // Show error dialog.
             var message;
             if (error.name == util.FileError.PATH_EXISTS_ERR ||
                 error.name == util.FileError.TYPE_MISMATCH_ERR) {
               // Check the existing entry is file or not.
               // 1) If the entry is a file:
               //   a) If we get PATH_EXISTS_ERR, a file exists.
               //   b) If we get TYPE_MISMATCH_ERR, a directory exists.
               // 2) If the entry is a directory:
@@ skipping 1196 matching lines @@
       callback(this.preferences_);
       return;
     }
 
     chrome.fileBrowserPrivate.getPreferences(function(prefs) {
       this.preferences_ = prefs;
       callback(prefs);
     }.bind(this));
   };
 })();