[gtk+] Add a csd style class

[Matthias Clasen <matthiasc src gnome org>]

commit 60cd7076cf885cbc421babfba44c9081ded3ad78
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Jun 6 17:53:50 2014 -0400

    Add a csd style class
    
    This will be used for client-side decorated windows.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=731187

 docs/reference/gtk/gtk3-sections.txt |    1 +
 gtk/gtkstylecontext.h                |   10 ++++++++++
 2 files changed, 11 insertions(+), 0 deletions(-)
---
diff --git a/docs/reference/gtk/gtk3-sections.txt b/docs/reference/gtk/gtk3-sections.txt
index a792e41..e37a61f 100644
--- a/docs/reference/gtk/gtk3-sections.txt
+++ b/docs/reference/gtk/gtk3-sections.txt
@@ -5966,6 +5966,7 @@ GTK_STYLE_CLASS_CALENDAR
 GTK_STYLE_CLASS_CELL
 GTK_STYLE_CLASS_COMBOBOX_ENTRY
 GTK_STYLE_CLASS_CHECK
+GTK_STYLE_CLASS_CSD
 GTK_STYLE_CLASS_CURSOR_HANDLE
 GTK_STYLE_CLASS_DEFAULT
 GTK_STYLE_CLASS_DESTRUCTIVE_ACTION
diff --git a/gtk/gtkstylecontext.h b/gtk/gtkstylecontext.h
index 1bab439..8a8351c 100644
--- a/gtk/gtkstylecontext.h
+++ b/gtk/gtkstylecontext.h
@@ -249,6 +249,16 @@ struct _GtkStyleContextClass
 #define GTK_STYLE_CLASS_RUBBERBAND "rubberband"
 
 /**
+ * GTK_STYLE_CLASS_CSD:
+ *
+ * A CSS class that gets added to windows which have
+ * client-side decorations.
+ *
+ * Since: 3.14
+ */
+#define GTK_STYLE_CLASS_CSD "csd"
+
+/**
  * GTK_STYLE_CLASS_TOOLTIP:
  *
  * A CSS class to match tooltip windows.