even more steps sounds test

src/frontend/LevelFrontend.h

@@ -8,6 +8,7 @@ class Level;
 class Assets;
 class BlocksPreview;
 class ContentGfxCache;
+class LevelController;
 
 class LevelFrontend {
     Level* level;
@@ -18,6 +19,8 @@ public:
     LevelFrontend(Level* level, Assets* assets);
     ~LevelFrontend();
 
+    void observe(LevelController* controller);
+
     Level* getLevel() const;
     Assets* getAssets() const;
     ContentGfxCache* getContentGfxCache() const;