Use document from preview for System Dialog printing on Windows.

chrome/browser/printing/print_job_worker.cc

Index: chrome/browser/printing/print_job_worker.cc
diff --git a/chrome/browser/printing/print_job_worker.cc b/chrome/browser/printing/print_job_worker.cc
index dd9c84b101ee8be6953bf708d073c0ea539e0b0e..276f5f69f698377e6b5d758d49c7caab47cb5625 100644
--- a/chrome/browser/printing/print_job_worker.cc
+++ b/chrome/browser/printing/print_job_worker.cc
@@ -114,7 +114,8 @@ void PrintJobWorker::GetSettings(
 }
 
 void PrintJobWorker::SetSettings(
-    const base::DictionaryValue* const new_settings) {
+    scoped_ptr<PrintingUIWebContentsObserver> web_contents_observer,
+    scoped_ptr<base::DictionaryValue> new_settings) {
   DCHECK(task_runner_->RunsTasksOnCurrentThread());
 
   BrowserThread::PostTask(
@@ -124,13 +125,17 @@ void PrintJobWorker::SetSettings(
                  make_scoped_refptr(owner_),
                  base::Bind(&PrintJobWorker::UpdatePrintSettings,
                             base::Unretained(this),
-                            base::Owned(new_settings))));
+                            base::Passed(&web_contents_observer),
+                            base::Passed(&new_settings))));
 }
 
 void PrintJobWorker::UpdatePrintSettings(
-    const base::DictionaryValue* const new_settings) {
-  PrintingContext::Result result =
-      printing_context_->UpdatePrintSettings(*new_settings);
+    scoped_ptr<PrintingUIWebContentsObserver> web_contents_observer,
+    scoped_ptr<base::DictionaryValue> new_settings) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  PrintingContext::Result result = printing_context_->UpdatePrintSettings(
+      *new_settings,
+      web_contents_observer ? web_contents_observer->GetParentView() : NULL);
   GetSettingsDone(result);
 }