Default implementation for AudioControl AIDL HAL

Bug: b/170335834
Test: Built in target and ran `adb shell dumpsys
android.hardware.automotive.audiocontrol.IAudioControl/default` commands

Change-Id: Iccf5784fce7635c78ca8cc0f9066b4dc9f24b3bd
diff --git a/automotive/audiocontrol/aidl/default/main.cpp b/automotive/audiocontrol/aidl/default/main.cpp
new file mode 100644
index 0000000..996665f
--- /dev/null
+++ b/automotive/audiocontrol/aidl/default/main.cpp
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2020 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.
+ */
+
+#include "AudioControl.h"
+
+#include <android-base/logging.h>
+#include <android/binder_manager.h>
+#include <android/binder_process.h>
+
+using aidl::android::hardware::automotive::audiocontrol::AudioControl;
+
+int main() {
+    ABinderProcess_setThreadPoolMaxThreadCount(0);
+    std::shared_ptr<AudioControl> audioControl = ndk::SharedRefBase::make<AudioControl>();
+
+    const std::string instance = std::string() + AudioControl::descriptor + "/default";
+    binder_status_t status =
+            AServiceManager_addService(audioControl->asBinder().get(), instance.c_str());
+    CHECK(status == STATUS_OK);
+
+    ABinderProcess_joinThreadPool();
+    return EXIT_FAILURE;  // should not reach
+}