Use document from preview for System Dialog printing on Windows.

printing/backend/win_helper.h

Index: printing/backend/win_helper.h
diff --git a/printing/backend/win_helper.h b/printing/backend/win_helper.h
index 18d035557e8a5785d4bffb50f5f0b7eef1165962..c6665f40fc791d2770ed30c78f5ebd0fe4c95c20 100644
--- a/printing/backend/win_helper.h
+++ b/printing/backend/win_helper.h
@@ -186,6 +186,14 @@ PRINTING_EXPORT scoped_ptr<DEVMODE, base::FreeDeleter> CreateDevMode(
     HANDLE printer,
     DEVMODE* in);
 
+// Prompts for new DEVMODE. If |in| is not NULL copy settings from there.
+PRINTING_EXPORT scoped_ptr<DEVMODE, base::FreeDeleter> PromptDevMode(
+    HANDLE printer,
+    const base::string16& printer_name,
+    DEVMODE* in,
+    HWND window,
+    bool* canceled);
+
 }  // namespace printing
 
 #endif  // PRINTING_BACKEND_WIN_HELPER_H_