Define an output file of runtime_resource_overlay

So that rros can be data of test modules.

Test: go test
Change-Id: I460a97fd9f430ec8e52ef6756d74b02693469d06
diff --git a/java/rro_test.go b/java/rro_test.go
index 0ccc8e7..3e4fed5 100644
--- a/java/rro_test.go
+++ b/java/rro_test.go
@@ -358,3 +358,21 @@
 		"--feature-flags @out/soong/.intermediates/bar/intermediate.txt --feature-flags @out/soong/.intermediates/baz/intermediate.txt",
 	)
 }
+
+func TestCanBeDataOfTest(t *testing.T) {
+	android.GroupFixturePreparers(
+		prepareForJavaTest,
+	).RunTestWithBp(t, `
+		runtime_resource_overlay {
+			name: "foo",
+			sdk_version: "current",
+		}
+		android_test {
+			name: "bar",
+			data: [
+				":foo",
+			],
+		}
+	`)
+	// Just test that this doesn't get errors
+}