Pass PWG raster conversion settings from Preview to Converter.

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 25b5b499bdf947887983f028863157fa5970898d..9a28ddb132570277b05abcb15d92b5f4cd67ffd0 100644
--- a/printing/print_job_constants.cc
+++ b/printing/print_job_constants.cc
@@ -105,6 +105,10 @@ const char kSettingPageRangeFrom[] = "from";
 // The last page of a page range. (1-based)
 const char kSettingPageRangeTo[] = "to";
 
+// Page size of document to print.
+const char kSettingPageWidth[] = "pageWidth";
+const char kSettingPageHeight[] = "pageHeight";
+
 const char kSettingPreviewModifiable[] = "previewModifiable";
 
 // Keys that specifies the printable area details.