Revert "Remove abandoned implementation."

Revert submission 3242160-remove-messaging-package

Reason for revert: Droidmonitor created revert due to b/364617310, b/364626927, b/364617560

Reverted changes: /q/submissionid:3241481-remove-messaging-package

This reverts commit 93b5e63726.

Change-Id: I182cbf1758988d9a4950d39354266a5fb3aaabce

tests/Android.bp

@@ -0,0 +1,45 @@
+//  Copyright (C) 2015 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 {
+    default_team: "trendy_team_messages",
+    // See: http://go/android-license-faq
+    default_applicable_licenses: [
+        "Android-Apache-2.0",
+    ],
+}
+
+android_test {
+    name: "messagingtests",
+    srcs: ["src/**/*.java"],
+    instrumentation_for: "messaging",
+    optimize: {
+        enabled: false,
+    },
+    sdk_version: "current",
+    test_suites: ["general-tests"],
+    certificate: "platform",
+    static_libs: [
+        "mockito-target",
+        "androidx.test.rules",
+    ],
+    libs: [
+        "android.test.mock.stubs",
+        "android.test.runner.stubs",
+        "android.test.base.stubs",
+    ],
+    data: [
+        ":messaging",
+    ],
+}