Add safe union for cpp-only test.

Bug: 110269925
Test: hidl_test
Change-Id: I18e52f8f41779e57828209882f1191aebc1e6782
diff --git a/tests/safeunion/cpp/1.0/Android.bp b/tests/safeunion/cpp/1.0/Android.bp
new file mode 100644
index 0000000..1111719
--- /dev/null
+++ b/tests/safeunion/cpp/1.0/Android.bp
@@ -0,0 +1,14 @@
+// This file is autogenerated by hidl-gen -Landroidbp.
+
+hidl_interface {
+    name: "android.hardware.tests.safeunion.cpp@1.0",
+    root: "android.hardware",
+    srcs: [
+        "ICppSafeUnion.hal",
+    ],
+    interfaces: [
+        "android.hidl.base@1.0",
+    ],
+    gen_java: false,
+}
+