Index: abi/include/abi/ipc/interfaces.h
===================================================================
--- abi/include/abi/ipc/interfaces.h	(revision 5d1e4e5d26c038897c197b32bf37e217a9824eb1)
+++ abi/include/abi/ipc/interfaces.h	(revision 7bcd15fa8041cc8c21cbf98b41cba30ec9aa11f3)
@@ -192,4 +192,8 @@
 	INTERFACE_GC =
 	    FOURCC_COMPACT('g', 'f', 'x', 'c') | IFACE_EXCHANGE_SERIALIZE,
+	INTERFACE_WNDMGT =
+	    FOURCC_COMPACT('w', 'm', 'g', 't') | IFACE_EXCHANGE_SERIALIZE,
+	INTERFACE_WNDMGT_CB =
+	    FOURCC_COMPACT('w', 'm', 'g', 't') | IFACE_EXCHANGE_SERIALIZE | IFACE_MOD_CALLBACK,
 } iface_t;