Added PrinterDriverInfo and PrintBackend::GetPrinterDriverInfo for windows.

printing/backend/print_backend.h

Index: printing/backend/print_backend.h
diff --git a/printing/backend/print_backend.h b/printing/backend/print_backend.h
index c7884997702b926fc21529bc69fb987d45074d85..4bf8ff3904a958b5309633feb87fcbffb9187512 100644
--- a/printing/backend/print_backend.h
+++ b/printing/backend/print_backend.h
@@ -43,6 +43,16 @@ struct PRINTING_EXPORT PrinterCapsAndDefaults {
   std::string defaults_mime_type;
 };
 
+struct PRINTING_EXPORT PrinterDriverInfo {
+  PrinterDriverInfo();
+  ~PrinterDriverInfo();
+
+  std::string driver_name;
+  std::string driver_version;
+  std::string product_name;
+  std::string product_version;
+};
+
 // PrintBackend class will provide interface for different print backends
 // (Windows, CUPS) to implement. User will call CreateInstance() to
 // obtain available print backend.
@@ -66,6 +76,11 @@ class PRINTING_EXPORT PrintBackend
       const std::string& printer_name,
       PrinterCapsAndDefaults* printer_info) = 0;
 
+  // Gets the information about driver for a specific printer.
+  virtual bool GetPrinterDriverInfo(
+      const std::string& printer_name,
+      PrinterDriverInfo* driver_info) = 0;
+
   // Returns true if printer_name points to a valid printer.
   virtual bool IsValidPrinter(const std::string& printer_name) = 0;