PrintPreview:[MAC] Added "Open PDF In Preview" option to open the pdf in native preview app.

printing/print_job_constants.h

Index: printing/print_job_constants.h
diff --git a/printing/print_job_constants.h b/printing/print_job_constants.h
index a44fcbfc071a41c116c207e16e52e2e058c2892c..cd6aa9315578d20ce9a52d845e9b95256831728c 100644
--- a/printing/print_job_constants.h
+++ b/printing/print_job_constants.h
@@ -5,6 +5,7 @@
 #ifndef PRINTING_PRINT_JOB_CONSTANTS_H_
 #define PRINTING_PRINT_JOB_CONSTANTS_H_
 
+#include "build/build_config.h"
 #include "printing/printing_export.h"
 
 namespace printing {
@@ -49,6 +50,10 @@ PRINTING_EXPORT extern const char kSettingPrintToPDF[];
 PRINTING_EXPORT extern const int FIRST_PAGE_INDEX;
 PRINTING_EXPORT extern const int COMPLETE_PREVIEW_DOCUMENT_INDEX;
 
+#if defined(OS_MACOSX)
+PRINTING_EXPORT extern const char kSettingOpenPDFInPreview[];
+#endif  // defined(OS_MACOSX)
+
 #if defined (USE_CUPS)
 // Printer color models
 PRINTING_EXPORT extern const char kBlack[];