PrintPreview: While printing the preview data, set the initiator tab title as print job name.

chrome/browser/resources/print_preview.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.
 
 var localStrings = new LocalStrings();
 var hasPDFPlugin = true;
 var expectedPageCount = 0;
 var pageRangesInfo = [];
-var printJobTitle = '';
+var printJobTitle = document.title;
 
 /**
  * Window onload handler, sets up the page.
  */
 function load() {
   $('printer-list').disabled = true;
   $('print-button').disabled = true;
 
   $('print-button').addEventListener('click', printFile);
 
@@ skipping 170 matching lines @@
   if (selectedPrinter >= 0)
     printerName = $('printer-list').options[selectedPrinter].textContent;
   var printAll = $('all-pages').checked;
   var twoSided = $('two-sided').checked;
   var copies = $('copies').value;
   var collate = $('collate').checked;
   var landscape = isLandscape();
   var color = isColor();
 
   return JSON.stringify({'printerName': printerName,
+                         'printJobTitle': printJobTitle,
                          'pageRange': pageRangesInfo,
                          'printAll': printAll,
                          'twoSided': twoSided,
                          'copies': copies,
                          'collate': collate,
                          'landscape': landscape,
                          'color': color});
 }
 
 /**
@@ skipping 165 matching lines @@
  * Depending on the validity of 'copies' value, enables/disables the print
  * button.
  */
 function updatePrintButtonState() {
   $('print-button').disabled = (!($('all-pages').checked ||
                                   $('pages').checkValidity()) ||
                                 !$('copies').checkValidity());
 }
 
 window.addEventListener('DOMContentLoaded', load);