Add unit_test test option in test configs

This change allows a test (native, java, rust or python) to be included
in host-unit-tests suite when test option `unit_test` is set to true.

Bug: 172006742
Test: m host-unit-tests
Change-Id: I69d3eb5b51198c549e2e6914ceac3a4fc33c3cf2
diff --git a/rust/androidmk.go b/rust/androidmk.go
index 29e4bd7..f98360a 100644
--- a/rust/androidmk.go
+++ b/rust/androidmk.go
@@ -116,6 +116,9 @@
 		if !BoolDefault(test.Properties.Auto_gen_config, true) {
 			fmt.Fprintln(w, "LOCAL_DISABLE_AUTO_GENERATE_TEST_CONFIG := true")
 		}
+		if Bool(test.Properties.Test_options.Unit_test) {
+			fmt.Fprintln(w, "LOCAL_IS_UNIT_TEST := true")
+		}
 	})
 	// TODO(chh): add test data with androidMkWriteTestData(test.data, ctx, ret)
 }