Use the convenience function gdk_screen_get_window_stack to enumerate top-lev...

chrome/common/gtk_util.h

Index: chrome/common/gtk_util.h
===================================================================
--- chrome/common/gtk_util.h	(revision 17916)
+++ chrome/common/gtk_util.h	(working copy)
@@ -10,6 +10,7 @@
 
 #include "base/gfx/point.h"
 #include "base/gfx/rect.h"
+#include "chrome/common/x11_util.h"
 #include "webkit/glue/window_open_disposition.h"
 
 typedef struct _GtkWidget GtkWidget;
@@ -79,6 +80,18 @@
 // Returns true if the screen is composited, false otherwise.
 bool IsScreenComposited();
 
+// Implementers of this interface receive a notification for every top-level
+// gdk window of the current display.
+class EnumerateWindowsDelegate {
+ public:
+  // |xid| is the X Window ID of the enumerated window.  Return true to stop
+  // further iteration.
+  virtual bool ShouldStopIterating(XID xid) = 0;
+};
+
+// Enumerates the top-level gdk windows of the current display.
+void EnumerateChildWindows(EnumerateWindowsDelegate* delegate);
+
 }  // namespace gtk_util
 
 #endif  // CHROME_COMMON_GTK_UTIL_H_