Update to follow framework.

Change-Id: Ib6e54f8843f51ea53859bcb5852befdaa19f0910
diff --git a/src/com/android/magicsmoke/MagicSmokeSelector.java b/src/com/android/magicsmoke/MagicSmokeSelector.java
index 22c7675..b7854f9 100644
--- a/src/com/android/magicsmoke/MagicSmokeSelector.java
+++ b/src/com/android/magicsmoke/MagicSmokeSelector.java
@@ -222,5 +222,8 @@
         public ParcelFileDescriptor setWallpaper(String name) {
             return null;
         }
+
+        public void engineShown(IWallpaperEngine engine) throws RemoteException {
+        }
     }
 }