ATest: GTest auto gen config support run_test_as in Android.bp .

Feature request from developer, support setting uid in Android.bp.

Bug:113359343

Test: source build/envsetup.sh ; lunch
    vim platform_testing/tests/example/native/Android.bp
    add
    test_options: {
        run_test_as: "1234",
    },
    in cc_test
    make hello_world_test
    cat out/target/product/xxxx/testcases/hello_world_test/hello_world_test.config
    Will see  <option name="run-test-as" value="1234" />
    below <test class="com.android.tradefed.testtype.GTest" >

Change-Id: I5604af5f20c45728d19f4c01396a20a74997f8a8

cc/test.go

@@ -31,6 +31,12 @@ type TestProperties struct {
 	Isolated *bool
 }
 
+// Test option struct.
+type TestOptions struct {
+	// the UID that you want to run in device.
+	Run_test_as string `android:"arch_variant"`
+}
+
 type TestBinaryProperties struct {
 	// Create a separate binary for each source file.  Useful when there is
 	// global state that can not be torn down and reset between each test suite.
@@ -56,6 +62,9 @@ type TestBinaryProperties struct {
 	// the name of the test configuration template (for example "AndroidTestTemplate.xml") that
 	// should be installed with the module.
 	Test_config_template *string `android:"arch_variant"`
+
+	// Test options.
+	Test_options *TestOptions
 }
 
 func init() {
@@ -244,8 +253,16 @@ func (test *testBinary) linkerFlags(ctx ModuleContext, flags Flags) Flags {
 
 func (test *testBinary) install(ctx ModuleContext, file android.Path) {
 	test.data = ctx.ExpandSources(test.Properties.Data, nil)
+
+	// Append new line in template like below
+	// <option name="run-test-as" value="1234" />
+	optionsMap := map[string]string{}
+	if test.Properties.Test_options != nil {
+		optionsMap["run-test-as"] = string(test.Properties.Test_options.Run_test_as)
+	}
+
 	test.testConfig = tradefed.AutoGenNativeTestConfig(ctx, test.Properties.Test_config,
-		test.Properties.Test_config_template)
+		test.Properties.Test_config_template, optionsMap)
 
 	test.binaryDecorator.baseInstaller.dir = "nativetest"
 	test.binaryDecorator.baseInstaller.dir64 = "nativetest64"