Change butter bar message depending on the type of operation and the number of files.

chrome/browser/resources/file_manager/js/file_copy_manager_wrapper.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.
 
 var fileCopyManagerWrapper = null;
 
 /**
  * While FileCopyManager is run in the background page, this class is used to
  * communicate with it.
  * @constructor
@@ skipping 52 matching lines @@
 FileCopyManagerWrapper.prototype.onEvent = function(eventName, eventArgs) {
   var event = new cr.Event(eventName);
   for (var arg in eventArgs)
     if (eventArgs.hasOwnProperty(arg))
       event[arg] = eventArgs[arg];
 
   this.dispatchEvent(event);
 };
 
 /**
- * Get the overall progress data of all queued copy tasks.
- * @return {Object} An object containing the following parameters:
- *    percentage - The percentage (0-1) of finished items.
- *    pendingItems - The number of pending/unfinished items.
- */
-FileCopyManagerWrapper.prototype.getProgress = function() {
-  var cm = this.getCopyManagerSync_();
-  if (cm)
-    return cm.getProgress();
-
-  return {percentage: NaN, pendingItems: 0};
-};
-
-/**
  * @return {Object} Status object.
  */
 FileCopyManagerWrapper.prototype.getStatus = function() {
   var cm = this.getCopyManagerSync_();
   if (cm)
     return cm.getStatus();
 
   return {
     pendingItems: 0,
     pendingFiles: 0,
     pendingDirectories: 0,
     pendingBytes: 0,
 
     completedItems: 0,
     completedFiles: 0,
     completedDirectories: 0,
     completedBytes: 0,
 
     totalItems: 0,
     totalFiles: 0,
     totalDirectories: 0,
-    totalBytes: 0
+    totalBytes: 0,
+
+    percentage: NaN,
+    pendingCopies: 0,
+    pendingMoves: 0,
+    filename: ''  // In case pendingItems == 1
   };
 };
 
 /**
  * Request that the current copy queue be abandoned.
  * @param {Function} opt_callback On cancel.
  */
 FileCopyManagerWrapper.prototype.requestCancel = function(opt_callback) {
   this.getCopyManagerAsync_(
       function(cm) {
         cm.requestCancel(opt_callback);
       });
 };
 
 /**
  * Convert string in clipboard to entries and kick off pasting.
  * @param {Object} clipboard Clipboard contents.
  * @param {string} targetPath Target path.
  * @param {boolean} targetOnGData If target is on GDrive.
  */
 FileCopyManagerWrapper.prototype.paste = function(clipboard, targetPath,
                                                   targetOnGData) {
   this.getCopyManagerAsync_(
       function(cm) {
         cm.paste(clipboard, targetPath, targetOnGData);
       });
 };