[gtk+] lock button: Add an element name

[Matthias Clasen <matthiasc src gnome org>]

commit a840a6d597d1a0f3e8da12988d5ed935c7635197
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Oct 28 23:57:57 2015 -0400

    lock button: Add an element name

 gtk/gtklockbutton.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtklockbutton.c b/gtk/gtklockbutton.c
index d0c973b..4e2e340 100644
--- a/gtk/gtklockbutton.c
+++ b/gtk/gtklockbutton.c
@@ -320,6 +320,7 @@ gtk_lock_button_class_init (GtkLockButtonClass *klass)
   gtk_widget_class_bind_template_child_private (widget_class, GtkLockButton, label_group);
 
   gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_LOCK_BUTTON_ACCESSIBLE);
+  gtk_widget_class_set_css_name (widget_class, "lockbutton");
 }
 
 static void