ScopedPrinterInfoSetter on crash prone blocks.

printing/backend/print_backend_cups.cc

Index: printing/backend/print_backend_cups.cc
diff --git a/printing/backend/print_backend_cups.cc b/printing/backend/print_backend_cups.cc
index 9a17ddf4c39d57ea9431a857c5259c976a5cffef..90050e646a261b15d628ac5b3702d7e3eff388d5 100644
--- a/printing/backend/print_backend_cups.cc
+++ b/printing/backend/print_backend_cups.cc
@@ -98,6 +98,7 @@ namespace printing {
 static const char kCUPSPrinterInfoOpt[] = "printer-info";
 static const char kCUPSPrinterStateOpt[] = "printer-state";
 static const char kCUPSPrinterTypeOpt[] = "printer-type";
+static const char kCUPSPrinterMakeModelOpt[] = "printer-make-and-model";
 
 class PrintBackendCUPS : public PrintBackend {
  public:
@@ -113,8 +114,8 @@ class PrintBackendCUPS : public PrintBackend {
       const std::string& printer_name,
       PrinterCapsAndDefaults* printer_info) OVERRIDE;
 
-  virtual bool GetPrinterDriverInfo(const std::string& printer_name,
-                                    std::string* driver_info) OVERRIDE;
+  virtual std::string GetPrinterDriverInfo(
+      const std::string& printer_name) OVERRIDE;
 
   virtual bool IsValidPrinter(const std::string& printer_name) OVERRIDE;
 
@@ -228,10 +229,23 @@ bool PrintBackendCUPS::GetPrinterCapsAndDefaults(
   return res;
 }
 
-bool PrintBackendCUPS::GetPrinterDriverInfo(const std::string& printer_name,
-                                            std::string* driver_info) {
-  // TODO(vitalybuka): MAC implementation. http://crbug.com/108194
-  return false;
+std::string PrintBackendCUPS::GetPrinterDriverInfo(
+    const std::string& printer_name) {
+  cups_dest_t* destinations = NULL;
+  int num_dests = GetDests(&destinations);
+  std::string result;
+  for (int printer_index = 0; printer_index < num_dests; printer_index++) {
+    const cups_dest_t& printer = destinations[printer_index];
+    if (printer_name == printer.name) {
+      const char* info = cupsGetOption(kCUPSPrinterMakeModelOpt, printer.num_options,
+                                       printer.options);
+      if (info)
+        result = *info;
+    }
+  }
+
+  cupsFreeDests(num_dests, destinations);
+  return result;
 }
 
 bool PrintBackendCUPS::IsValidPrinter(const std::string& printer_name) {