[gtk+] stylecontext: add a define for an OSD style class

[Cosimo Cecchi <cosimoc src gnome org>]

commit a94f4a43878a0eb15f14b396a628ee4fe3581e28
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Thu Apr 19 15:01:04 2012 -0400

    stylecontext: add a define for an OSD style class

 docs/reference/gtk/gtk3-sections.txt |    1 +
 gtk/gtkstylecontext.h                |    8 ++++++++
 2 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/docs/reference/gtk/gtk3-sections.txt b/docs/reference/gtk/gtk3-sections.txt
index beb2090..b6a47ac 100644
--- a/docs/reference/gtk/gtk3-sections.txt
+++ b/docs/reference/gtk/gtk3-sections.txt
@@ -5678,6 +5678,7 @@ GTK_STYLE_CLASS_LEFT
 GTK_STYLE_CLASS_RIGHT
 GTK_STYLE_CLASS_LINKED
 GTK_STYLE_CLASS_ARROW
+GTK_STYLE_CLASS_OSD
 GTK_STYLE_REGION_COLUMN
 GTK_STYLE_REGION_COLUMN_HEADER
 GTK_STYLE_REGION_ROW
diff --git a/gtk/gtkstylecontext.h b/gtk/gtkstylecontext.h
index ff1e7f5..1a1f73e 100644
--- a/gtk/gtkstylecontext.h
+++ b/gtk/gtkstylecontext.h
@@ -673,6 +673,14 @@ struct _GtkStyleContextClass
  */
 #define GTK_STYLE_CLASS_ARROW "arrow"
 
+/**
+ * GTK_STYLE_CLASS_OSD:
+ *
+ * A CSS class used when rendering an OSD (On Screen Display) element,
+ * on top of another container.
+ */
+#define GTK_STYLE_CLASS_OSD "osd"
+
 /* Predefined set of widget regions */
 
 /**