Put update_engine to blkio background group
am: 13bdba8cdc

Change-Id: I6664f84fe4cddfc3ff203506108f56b3f4a39474
diff --git a/Android.bp b/Android.bp
index 57b2feb..a13a92b 100644
--- a/Android.bp
+++ b/Android.bp
@@ -740,3 +740,12 @@
         },
     },
 }
+
+// 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",
+    ],
+}