Run ipc_tests serially when using new test launcher.

base/test/launcher/unit_test_launcher.h

Index: base/test/launcher/unit_test_launcher.h
diff --git a/base/test/launcher/unit_test_launcher.h b/base/test/launcher/unit_test_launcher.h
index a2afdb2521d8d04b6ba3e9fd83b7bb4e25b221ee..05edc69b8489bcf1ac0c23d10d5fdde1a47e0bcd 100644
--- a/base/test/launcher/unit_test_launcher.h
+++ b/base/test/launcher/unit_test_launcher.h
@@ -17,6 +17,11 @@ int LaunchUnitTests(int argc,
                     char** argv,
                     const RunTestSuiteCallback& run_test_suite);
 
+// Same as above, but always runs tests serially.
+int LaunchUnitTestsSerially(int argc,
+                            char** argv,
+                            const RunTestSuiteCallback& run_test_suite);
+
 }   // namespace base
 
 #endif  // BASE_TEST_LAUNCHER_UNIT_TEST_LAUNCHER_H_