Vending: Add PlayGearheadService dummy

vending-app/src/main/AndroidManifest.xml

@@ -201,5 +201,9 @@
             </intent-filter>
         </receiver>
 
+        <service
+            android:name="com.google.android.finsky.services.PlayGearheadService"
+            android:exported="true" />
+
     </application>
 </manifest>

vending-app/src/main/aidl/com/google/android/finsky/services/IPlayGearheadService.aidl

@@ -0,0 +1,10 @@
+/*
+ * SPDX-FileCopyrightText: 2023 microG Project Team
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package com.google.android.finsky.services;
+
+interface IPlayGearheadService {
+    Bundle isPackageInstalledByPlayCheck(in String pkgName);
+}

vending-app/src/main/kotlin/com/google/android/finsky/services/PlayGearheadService.kt

@@ -0,0 +1,41 @@
+/*
+ * SPDX-FileCopyrightText: 2023 microG Project Team
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package com.google.android.finsky.services
+
+import android.content.Context
+import android.content.Intent
+import android.os.Bundle
+import android.os.IBinder
+import android.util.Log
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.LifecycleOwner
+import androidx.lifecycle.LifecycleService
+
+private const val TAG = "PlayGearheadService"
+
+class PlayGearheadService : LifecycleService() {
+
+    override fun onBind(intent: Intent): IBinder? {
+        super.onBind(intent)
+        Log.d(TAG, "onBind")
+        return PlayGearheadServiceImpl(this, lifecycle).asBinder()
+    }
+
+    override fun onUnbind(intent: Intent?): Boolean {
+        Log.d(TAG, "onUnbind")
+        return super.onUnbind(intent)
+    }
+}
+
+private class PlayGearheadServiceImpl(
+    private val context: Context, override val lifecycle: Lifecycle
+) : IPlayGearheadService.Stub(), LifecycleOwner {
+
+    override fun isPackageInstalledByPlayCheck(pkgName: String?): Bundle {
+        Log.d(TAG, "isPackageInstalledByPlayCheck: pkgName: $pkgName")
+        return Bundle().apply { putBoolean("Finsky.IsValid", true) }
+    }
+}