Install structuring for ping-pong protocol
diff --git a/src/compositor.h b/src/compositor.h
index a4f5209..e9c6823 100644
--- a/src/compositor.h
+++ b/src/compositor.h
@@ -234,6 +234,8 @@
 	void (*destroy)(struct weston_compositor *ec);
 	int (*authenticate)(struct weston_compositor *c, uint32_t id);
 
+	void (*ping_handler)(struct weston_surface *surface, uint32_t serial);
+
 	struct screenshooter *screenshooter;
 	int launcher_sock;
 };