Add a "Simplify Page" option to the print preview dialog

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 ffaa88513d17f9699f50282b267940c4e2977234..bcc7ab8c69382ce783e83dddaa07209e39c8afc7 100644
--- a/printing/print_job_constants.cc
+++ b/printing/print_job_constants.cc
@@ -54,6 +54,9 @@ const char kSettingDeviceName[] = "deviceName";
 // Option to disable scaling. True if scaling is disabled else false.
 const char kSettingDisableScaling[] = "disableScaling";
 
+// Option to print a distilled page: true if requested, false if not.
+const char kSettingDistillPageEnabled[] = "distillPage";
+
 // Print job duplex mode.
 const char kSettingDuplexMode[] = "duplex";