1 files changed, 13 insertions, 0 deletions
diff --git a/chrome/service/cloud_print/print_system_win.cc b/chrome/service/cloud_print/print_system_win.cc
index 229f2794..6b1d5df 100644
--- a/chrome/service/cloud_print/print_system_win.cc
+++ b/chrome/service/cloud_print/print_system_win.cc
@@ -35,9 +35,22 @@ namespace {
 
 class PrinterChangeHandleTraits {
  public:
+  typedef HANDLE Handle;
+
   static bool CloseHandle(HANDLE handle) {
     return ::FindClosePrinterChangeNotification(handle) != FALSE;
   }
+
+  static bool IsHandleValid(HANDLE handle) {
+    return handle != NULL;
+  }
+
+  static HANDLE NullHandle() {
+    return NULL;
+  }
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(PrinterChangeHandleTraits);
 };
 
 typedef base::win::GenericScopedHandle<PrinterChangeHandleTraits>