Improvements in --debug-print switch implementation.

chrome/browser/printing/print_job.cc

Index: chrome/browser/printing/print_job.cc
diff --git a/chrome/browser/printing/print_job.cc b/chrome/browser/printing/print_job.cc
index 0171951e2b2bf66975b322b6bc932e81d07bf5e0..4a58440685b984e39077a05cc30f1c1ca01632e3 100644
--- a/chrome/browser/printing/print_job.cc
+++ b/chrome/browser/printing/print_job.cc
@@ -12,6 +12,7 @@
 #include "base/timer/timer.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/printing/print_job_worker.h"
+#include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_service.h"
 #include "printing/printed_document.h"
 #include "printing/printed_page.h"
@@ -69,7 +70,10 @@ void PrintJob::Initialize(PrintJobWorkerOwner* job,
   settings_ = job->settings();
 
   PrintedDocument* new_doc =
-      new PrintedDocument(settings_, source_, job->cookie());
+      new PrintedDocument(settings_,
+                          source_,
+                          job->cookie(),
+                          content::BrowserThread::GetBlockingPool());
   new_doc->set_page_count(page_count);
   UpdatePrintedDocument(new_doc);