[JS Changes] Support NumCopies print preset

printing/print_job_constants.cc

Index: printing/print_job_constants.cc
diff --git a/printing/print_job_constants.cc b/printing/print_job_constants.cc
index 8d3619994d554fcad3cdd27f9b2369fccd2762f8..3caadd10d38677d358a979378eb0dcfa2c9556b1 100644
--- a/printing/print_job_constants.cc
+++ b/printing/print_job_constants.cc
@@ -51,6 +51,9 @@ const char kSettingCopies[] = "copies";
 // Device name: Unique printer identifier.
 const char kSettingDeviceName[] = "deviceName";
 
+// Option to disable scaling. True if scaling is disabled else false.
+const char kSettingDisableScaling[] = "disableScaling";
+
 // Print job duplex mode.
 const char kSettingDuplexMode[] = "duplex";