https://codereview.chromium.org/download/issue2258333004_1_10001.diff

Index: printing/backend/cups_helper.h
diff --git a/printing/backend/cups_helper.h b/printing/backend/cups_helper.h
index fd7601dc975978edc57c384d6fe92425d77e83cc..b72903ff89dee0a3261aaaf840675f41eb518411 100644
--- a/printing/backend/cups_helper.h
+++ b/printing/backend/cups_helper.h
@@ -6,6 +6,7 @@
 #define PRINTING_BACKEND_CUPS_HELPER_H_
 
 #include <cups/cups.h>
+#include <cups/ppd.h>
 
 #include "base/strings/string_piece.h"
 #include "printing/printing_export.h"