Add manual rollback sample app

This application can be installed as a signature app. It displays
all available rollbacks, and will manually trigger the rollback of
all selected rollback IDs. This application will not trigger a
reboot in the case of staged rollbacks.

Test: m SampleRollbackApp, adb install. Manually install a train
      with rollback enabled and reboot. Verify that the available
      rollback is displayed, and that the rollback can be committed.
Bug: 220204580
Change-Id: Id2e5afac9e25532d8c24ea2b803c07dcfdb84d85
diff --git a/tests/RollbackTest/SampleRollbackApp/Android.bp b/tests/RollbackTest/SampleRollbackApp/Android.bp
new file mode 100644
index 0000000..a18488d
--- /dev/null
+++ b/tests/RollbackTest/SampleRollbackApp/Android.bp
@@ -0,0 +1,32 @@
+// Copyright (C) 2022 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package {
+    // See: http://go/android-license-faq
+    // A large-scale-change added 'default_applicable_licenses' to import
+    // all of the 'license_kinds' from "frameworks_base_license"
+    // to get the below license kinds:
+    //   SPDX-license-identifier-Apache-2.0
+    default_applicable_licenses: ["frameworks_base_license"],
+}
+
+android_app {
+    name: "SampleRollbackApp",
+    srcs: [
+        "src/**/*.java",
+    ],
+    resource_dirs: ["res"],
+    certificate: "platform",
+    sdk_version: "system_current",
+}