Allow unit tests to force serial execution in the test launcher.

base/gtest_prod_util.h

Index: base/gtest_prod_util.h
diff --git a/base/gtest_prod_util.h b/base/gtest_prod_util.h
index 3289e6301da7182ea5fc7689557745dd2ff6f747..cb2ff581a2b6ee008d5172c91b99b3a43eb904eb 100644
--- a/base/gtest_prod_util.h
+++ b/base/gtest_prod_util.h
@@ -63,4 +63,11 @@
   class test_case_name##_##DISABLED_##test_name##_Test; \
   class test_case_name##_##FLAKY_##test_name##_Test
 
+#define TEST_F_SERIALIZE(test_fixture, test_name) \
+    TEST_F(test_fixture, SERIALIZE_ ## test_name)
+#define TEST_SERIALIZE(test_case_name, test_name) \
+    TEST(test_case_name, SERIALIZE_ ## test_name)
+#define TYPED_TEST_SERIALIZE(test_fixture, test_name) \
+    TYPED_TEST(test_fixture, SERIALIZE_ ## test_name)
+
 #endif  // BASE_GTEST_PROD_UTIL_H_