Allow page range selection in system dialog called from preview

printing/printing_context.h

Index: printing/printing_context.h
diff --git a/printing/printing_context.h b/printing/printing_context.h
index 0d9f6052e34bfe0610d4b7bd43e185abb70ecdef..3d260efe4b08b967cc7d94ab15f4a961c6c72be8 100644
--- a/printing/printing_context.h
+++ b/printing/printing_context.h
@@ -77,7 +77,8 @@ class PRINTING_EXPORT PrintingContext {
   // |external_preview| is true if pdf is going to be opened in external
   // preview. Used by MacOS only now to open Preview.app.
   virtual Result UpdatePrinterSettings(bool external_preview,
-                                       bool show_system_dialog) = 0;
+                                       bool show_system_dialog,
+                                       int page_count) = 0;
 
   // Updates Print Settings. |job_settings| contains all print job
   // settings information. |ranges| has the new page range settings.