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..c8a9cd173bde0431c252b86a565bfcbae821cf99 100644
--- a/printing/print_job_constants.cc
+++ b/printing/print_job_constants.cc
@@ -64,6 +64,9 @@ const char kSettingFitToPageEnabled[] = "fitToPageEnabled";
 // True, when a new set of draft preview data is required.
 const char kSettingGenerateDraftData[] = "generateDraftData";
 
+// Option to print a distilled page: true if requested, false if not.
+const char kSettingDistillPageEnabled[] = "distillPage";
+
 // Option to print headers and Footers: true if selected, false if not.
 const char kSettingHeaderFooterEnabled[] = "headerFooterEnabled";