Add rules.aar

third_party/android_support_test_runner/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/android/rules.gni")
 
 android_java_prebuilt("runner_java") {
   testonly = true
   jar_path = "lib/runner-0.5-release-no-dep.jar"
   deps = [
     ":exposed_instrumentation_api_publish_java",
     "//third_party/guava:guava_java",
     "//third_party/junit",
   ]
 }
 
 android_java_prebuilt("exposed_instrumentation_api_publish_java") {
   jar_path = "lib/exposed-instrumentation-api-publish-0.5-no-dep.jar"
 }
+
+android_aar_prebuilt("rules_java") {
+  aar_path = "lib/rules-0.5.aar"
+}