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/cc/androidmk.go b/cc/androidmk.go
index 38269cb..8c1aead 100644
--- a/cc/androidmk.go
+++ b/cc/androidmk.go
@@ -370,6 +370,9 @@
 			entries.SetBool("LOCAL_DISABLE_AUTO_GENERATE_TEST_CONFIG", true)
 		}
 		entries.AddStrings("LOCAL_TEST_MAINLINE_MODULES", test.Properties.Test_mainline_modules...)
+		if Bool(test.Properties.Test_options.Unit_test) {
+			entries.SetBool("LOCAL_IS_UNIT_TEST", true)
+		}
 	})
 
 	androidMkWriteTestData(test.data, ctx, entries)
diff --git a/cc/test.go b/cc/test.go
index 619dc4d..3772691 100644
--- a/cc/test.go
+++ b/cc/test.go
@@ -46,6 +46,9 @@
 
 	// a list of extra test configuration files that should be installed with the module.
 	Extra_test_configs []string `android:"path,arch_variant"`
+
+	// If the test is a hostside(no device required) unittest that shall be run during presubmit check.
+	Unit_test *bool
 }
 
 type TestBinaryProperties struct {