Add initial GTK web accessibility framework (third attempt).

ui/gfx/gtk_preserve_window.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_GFX_GTK_PRESERVE_WINDOW_H_
 #define UI_GFX_GTK_PRESERVE_WINDOW_H_
 #pragma once
 
+#include <atk/atk.h>
 #include <gdk/gdk.h>
 #include <gtk/gtk.h>
 
 #include "ui/base/ui_export.h"
 
 // GtkFixed creates an X window when realized and destroys an X window
 // when unrealized. GtkPreserveWindow allows overrides this
 // behaviour. When preserve is set (via gtk_preserve_window_set_preserve),
 // the X window is only destroyed when the widget is destroyed.
 
@@ skipping 35 matching lines @@
 gboolean gtk_preserve_window_get_preserve(GtkPreserveWindow* widget);
 void gtk_preserve_window_set_preserve(GtkPreserveWindow* widget,
                                       gboolean value);
 
 // Whether or not someone else will gdk_window_resize the GdkWindow associated
 // with this widget (needed by the GPU process to synchronize resizing
 // with swapped between front and back buffer).
 UI_EXPORT void gtk_preserve_window_delegate_resize(GtkPreserveWindow* widget,
                                                    gboolean delegate);
 
+// Provide a function to return an AtkObject* when calls to get_accessible
+// are made on this widget. The parameter |userdata| will be passed to the
+// factory function.
+void gtk_preserve_window_set_accessible_factory(
+    GtkPreserveWindow* widget,
+    AtkObject* (*factory)(void* userdata),
+    gpointer userdata);
+
 G_END_DECLS
 
 #endif  // UI_GFX_GTK_PRESERVE_WINDOW_H_