Add title property to chrome.printerProvider pritn job

extensions/browser/api/printer_provider/printer_provider_print_job.h

Index: extensions/browser/api/printer_provider/printer_provider_print_job.h
diff --git a/extensions/browser/api/printer_provider/printer_provider_print_job.h b/extensions/browser/api/printer_provider/printer_provider_print_job.h
index 81fc9b8674fd47fd1aa6aabfa60cb8e4f548803f..4148d0d40092dec5dcda60170d77f3937f7d82ee 100644
--- a/extensions/browser/api/printer_provider/printer_provider_print_job.h
+++ b/extensions/browser/api/printer_provider/printer_provider_print_job.h
@@ -11,6 +11,7 @@
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/ref_counted_memory.h"
+#include "base/strings/string16.h"
 
 namespace extensions {
 
@@ -30,6 +31,9 @@ struct PrinterProviderPrintJob {
   // chrome.printerProvider.onGetPrintersRequested event callback).
   std::string printer_id;
 
+  // The print job title.
+  base::string16 job_title;
+
   // The print job ticket.
   std::string ticket_json;