Add an autoconf field to printer objects.

chromeos/printing/printer_configuration.h

Index: chromeos/printing/printer_configuration.h
diff --git a/chromeos/printing/printer_configuration.h b/chromeos/printing/printer_configuration.h
index cac44c16d437a69154d647fa78a831dbd9c5572d..6b9bd641acf4b95cfc62e6b3cd4644a0dbcddde8 100644
--- a/chromeos/printing/printer_configuration.h
+++ b/chromeos/printing/printer_configuration.h
@@ -36,6 +36,9 @@ class CHROMEOS_EXPORT Printer {
     // Where possible, this is the same as the ipp/ldap
     // printer-make-and-model field.
     std::string effective_make_and_model;
+
+    // True if the printer should be auto-configured and a PPD is unnecessary.
+    bool autoconf = false;
   };
 
   // The location where the printer is stored.