Reapply r50859 with chromeos fixes.

chrome/browser/gtk/gtk_custom_menu.h

Index: chrome/browser/gtk/gtk_custom_menu.h
diff --git a/chrome/browser/gtk/gtk_custom_menu.h b/chrome/browser/gtk/gtk_custom_menu.h
new file mode 100644
index 0000000000000000000000000000000000000000..a2fc7572dbecb33a42c322154313cf0f711b87d8
--- /dev/null
+++ b/chrome/browser/gtk/gtk_custom_menu.h
@@ -0,0 +1,53 @@
+// Copyright (c) 2010 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 CHROME_BROWSER_GTK_GTK_CUSTOM_MENU_H_
+#define CHROME_BROWSER_GTK_GTK_CUSTOM_MENU_H_
+
+// GtkCustomMenu is a GtkMenu subclass that can contain, and collaborates with,
+// GtkCustomMenuItem instances. GtkCustomMenuItem is a GtkMenuItem that can
+// have buttons and other normal widgets embeded in it. GtkCustomMenu exists
+// only to override most of the button/motion/move callback functions so
+// that the normal GtkMenu implementation doesn't handle events related to
+// GtkCustomMenuItem items.
+//
+// For a more through overview of this system, see the comments in
+// gtk_custom_menu_item.h.
+
+#include <gdk/gdk.h>
+#include <gtk/gtk.h>
+#include <gtk/gtkmenuitem.h>
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_CUSTOM_MENU                                            \
+  (gtk_custom_menu_get_type())
+#define GTK_CUSTOM_MENU(obj)                                            \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj), GTK_TYPE_CUSTOM_MENU, GtkCustomMenu))
+#define GTK_CUSTOM_MENU_CLASS(klass)                                    \
+  (G_TYPE_CHECK_CLASS_CAST((klass), GTK_TYPE_CUSTOM_MENU, GtkCustomMenuClass))
+#define GTK_IS_CUSTOM_MENU(obj)                                         \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj), GTK_TYPE_CUSTOM_MENU))
+#define GTK_IS_CUSTOM_MENU_CLASS(klass)                                 \
+  (G_TYPE_CHECK_CLASS_TYPE((klass), GTK_TYPE_CUSTOM_MENU))
+#define GTK_CUSTOM_MENU_GET_CLASS(obj)                                  \
+  (G_TYPE_INSTANCE_GET_CLASS((obj), GTK_TYPE_CUSTOM_MENU, GtkCustomMenuClass))
+
+typedef struct _GtkCustomMenu GtkCustomMenu;
+typedef struct _GtkCustomMenuClass GtkCustomMenuClass;
+
+struct _GtkCustomMenu {
+  GtkMenu menu;
+};
+
+struct _GtkCustomMenuClass {
+  GtkMenuClass parent_class;
+};
+
+GType gtk_custom_menu_get_type(void) G_GNUC_CONST;
+GtkWidget* gtk_custom_menu_new();
+
+G_END_DECLS
+
+#endif  // CHROME_BROWSER_GTK_GTK_CUSTOM_MENU_H_