Virtualvfunc_Virtualvfunc_Gets a hash for an icon.
Virtualvfunc_Serializes a Gio.Icon into a GLib.Variant. An equivalent Gio.Icon can be retrieved
back by calling g_icon_deserialize() on the returned value.
As serialization will avoid using raw icon data when possible, it only
makes sense to transfer the GLib.Variant between processes on the same machine,
(as opposed to over the network), and within the same file system namespace.
Virtualvfunc_Serializes the icon into string tokens.
This is can be invoked when g_icon_new_for_string() is called.
Interface for implementing Icon. Contains only the virtual methods that need to be implemented.