Add title property to chrome.printerProvider pritn job

extensions/test/data/api_test/printer_provider/request_print/test.js

Index: extensions/test/data/api_test/printer_provider/request_print/test.js
diff --git a/extensions/test/data/api_test/printer_provider/request_print/test.js b/extensions/test/data/api_test/printer_provider/request_print/test.js
index c0942eafd329f8f9de5e4ac477c342d9a03c6277..86baf086ca1774497572ff34450ff076a328ca8a 100644
--- a/extensions/test/data/api_test/printer_provider/request_print/test.js
+++ b/extensions/test/data/api_test/printer_provider/request_print/test.js
@@ -64,6 +64,8 @@ chrome.test.sendMessage('loaded', function(test) {
             if (content)
               chrome.test.assertEq('bytes', content);
 
+            chrome.test.assertEq('Print job', job.title);
+
             chrome.test.succeed();
           });