Set the job name for the print job on the Mac....

printing/printing_context_mac.mm

Index: printing/printing_context_mac.mm
===================================================================
--- printing/printing_context_mac.mm	(revision 47035)
+++ printing/printing_context_mac.mm	(working copy)
@@ -29,7 +29,7 @@
 
 
 PrintingContext::Result PrintingContext::AskUserForSettings(
-    gfx::NativeWindow window, int max_pages, bool has_selection) {
+    gfx::NativeView parent_view, int max_pages, bool has_selection) {
   DCHECK([NSThread isMainThread]);
 
   // We deliberately don't feed max_pages into the dialog, because setting
@@ -40,6 +40,7 @@
   // adding a new custom view to the panel on 10.5; 10.6 has
   // NSPrintPanelShowsPrintSelection).
   NSPrintPanel* panel = [NSPrintPanel printPanel];
+  NSPrintInfo* printInfo = [NSPrintInfo sharedPrintInfo];
 
   NSPrintPanelOptions options = [panel options];
   options |= NSPrintPanelShowsPaperSize;
@@ -47,10 +48,15 @@
   options |= NSPrintPanelShowsScaling;
   [panel setOptions:options];
 
+  NSString* job_title = [[parent_view window] title];
+  PMPrintSettings printSettings = (PMPrintSettings)[printInfo PMPrintSettings];
+  PMPrintSettingsSetJobName(printSettings, (CFStringRef)job_title);

[stuartmorgan, 2010/05/12 18:54:43]

Do you need to nil-check job_title before calling this?

+  [printInfo updateFromPMPrintSettings];
+
   // TODO(stuartmorgan): We really want a tab sheet here, not a modal window.
   // Will require restructuring the PrintingContext API to use a callback.
   NSInteger selection =
-      [panel runModalWithPrintInfo:[NSPrintInfo sharedPrintInfo]];
+      [panel runModalWithPrintInfo:printInfo];
   if (selection != NSOKButton) {
     return CANCEL;
   }