mutter/src/wayland/protocol/gtk-shell.xml

<protocol name="gtk">

  <interface name="gtk_shell1" version="2">
    <description summary="gtk specific extensions">
      gtk_shell is a protocol extension providing additional features for
      clients implementing it.
    </description>

    <enum name="capability">
      <entry name="global_app_menu" value="1"/>
      <entry name="global_menu_bar" value="2"/>
      <entry name="desktop_icons" value="3"/>
    </enum>

    <event name="capabilities">
      <arg name="capabilities" type="uint"/>
    </event>

    <request name="get_gtk_surface">
      <arg name="gtk_surface" type="new_id" interface="gtk_surface1"/>
      <arg name="surface" type="object" interface="wl_surface"/>
    </request>

    <request name="set_startup_id">
      <arg name="startup_id" type="string" allow-null="true"/>
    </request>

    <request name="system_bell">
      <arg name="surface" type="object" interface="gtk_surface1" allow-null="true"/>
    </request>
  </interface>

  <interface name="gtk_surface1" version="2">
    <request name="set_dbus_properties">
      <arg name="application_id" type="string" allow-null="true"/>
      <arg name="app_menu_path" type="string" allow-null="true"/>
      <arg name="menubar_path" type="string" allow-null="true"/>
      <arg name="window_object_path" type="string" allow-null="true"/>
      <arg name="application_object_path" type="string" allow-null="true"/>
      <arg name="unique_bus_name" type="string" allow-null="true"/>
    </request>

    <request name="set_modal"/>
    <request name="unset_modal"/>

    <request name="present">
      <arg name="time" type="uint"/>
    </request>

    <!-- Version 2 additions -->

    <enum name="state">
      <entry name="tiled" value="1"/>

      <entry name="tiled_top" value="2" since="2" />
      <entry name="tiled_right" value="3" since="2" />
      <entry name="tiled_bottom" value="4" since="2" />
      <entry name="tiled_left" value="5"  since="2" />
    </enum>

    <enum name="edge_constraint" since="2">
      <entry name="resizable_top" value="1"/>
      <entry name="resizable_right" value="2"/>
      <entry name="resizable_bottom" value="3"/>
      <entry name="resizable_left" value="4"/>
    </enum>

    <event name="configure">
      <arg name="states" type="array"/>
    </event>

    <event name="configure_edges" since="2">
      <arg name="constraints" type="array"/>
    </event>
  </interface>

</protocol>