update_engine requires update_engine_payload_key. am: 1e1c86cd64
am: 3799647e6b

Change-Id: Ic92d46fcf052876d3a58be66f7985dea856478a5
diff --git a/Android.bp b/Android.bp
index ce43bea..3974090 100644
--- a/Android.bp
+++ b/Android.bp
@@ -734,3 +734,12 @@
         },
     },
 }
+
+// AIDL interface between libupdate_engine and the Things jar.
+filegroup {
+    name: "things_update_engine_aidl",
+    srcs: [
+        "binder_bindings/android/brillo/IUpdateEngine.aidl",
+        "binder_bindings/android/brillo/IUpdateEngineStatusCallback.aidl",
+    ],
+}