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

chrome/renderer/print_web_view_helper.h

Index: chrome/renderer/print_web_view_helper.h
diff --git a/chrome/renderer/print_web_view_helper.h b/chrome/renderer/print_web_view_helper.h
index 596740c5ae6d28144289579ebbf507ba3aee9da6..e7c2c80b4dced197efcc2a76fffbbd4f6eadd05e 100644
--- a/chrome/renderer/print_web_view_helper.h
+++ b/chrome/renderer/print_web_view_helper.h
@@ -241,6 +241,12 @@ class PrintWebViewHelper : public RenderViewObserver ,
   int user_cancelled_scripted_print_count_;
   bool is_preview_;
 
+  // For preview printing, |job_title_| is initiator tab title. Print view
+  // manager will use this value to set the print job name.
+  // For normal printing, |job_title_| is empty. Print view manager will use
+  // the current tab title as print job name.
+  string16 job_title_;
+
   DISALLOW_COPY_AND_ASSIGN(PrintWebViewHelper);
 };