Setting focus on the text box in the "Save file as" dialog.

chrome/browser/resources/file_manager/js/file_manager.js

 // Copyright (c) 2011 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.
 
 // Setting the src of an img to an empty string can crash the browser, so we
 // use an empty 1x1 gif instead.
 const EMPTY_IMAGE_URI = 'data:image/gif;base64,'
         + 'R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw%3D%3D';
 
 var g_slideshow_data = null;
@@ skipping 908 matching lines @@
     // If types are same both subtypes are defined of both are undefined.
     result = this.collator_.compare(a.cachedFileType_.subtype || '',
                                     b.cachedFileType_.subtype || '');
     if (result != 0)
       return result;
 
     return this.collator_.compare(a.name, b.name);
   };
 
   FileManager.prototype.refocus = function() {
-    this.document_.querySelector('[tabindex="0"]').focus();
+    if (this.dialogType_ == FileManager.DialogType.SELECT_SAVEAS_FILE)
+      this.filenameInput_.focus();
+    else
+      this.document_.querySelector('[tabindex="0"]').focus();
   };
 
   FileManager.prototype.showButter = function(message, opt_options) {
     var butter = this.document_.createElement('div');
     butter.className = 'butter-bar';
     butter.style.top = '-30px';
     this.dialogDom_.appendChild(butter);
 
     var self = this;
 
@@ skipping 3050 matching lines @@
           });
       }, onError);
 
       function onError(err) {
         console.log('Error while checking free space: ' + err);
         setTimeout(doCheck, 1000 * 60);
       }
     }
   }
 })();