PrintPreview: While printing the preview data, set the initiator tab title as print job name.

printing/printing_context_mac.h

Index: printing/printing_context_mac.h
diff --git a/printing/printing_context_mac.h b/printing/printing_context_mac.h
index 6c7097c4a75d4b2cdc5c5aa4258b4b7b09639c90..eb99d2fadfed849386b463abd430736198e9b9c7 100644
--- a/printing/printing_context_mac.h
+++ b/printing/printing_context_mac.h
@@ -12,8 +12,10 @@
 
 #ifdef __OBJC__
 @class NSPrintInfo;
+@class NSString;
 #else
 class NSPrintInfo;
+class NSString;
 #endif  // __OBJC__
 
 namespace printing {
@@ -51,6 +53,13 @@ class PrintingContextMac : public PrintingContext {
   // Returns true if the printer was set else returns false.
   bool SetPrinter(const std::string& printer_name);
 
+  // Sets print job name.
+  // Returns true if print job name is set else returns false.
+  bool SetPrintJobName(const string16& job_name);
+
+  // Updates |printInfo| with the given |job_name|.
+  void UpdatePrintInfoWithJobName(NSPrintInfo* printInfo, NSString* job_name);
+
   // The native print info object.
   scoped_nsobject<NSPrintInfo> print_info_;