Limit the layout_test batch size for *SAN builds.

Tools/Scripts/webkitpy/layout_tests/port/port_testcase.py

Index: Tools/Scripts/webkitpy/layout_tests/port/port_testcase.py
diff --git a/Tools/Scripts/webkitpy/layout_tests/port/port_testcase.py b/Tools/Scripts/webkitpy/layout_tests/port/port_testcase.py
index 94d7b2cfed05d9f86e83c3aa094c8c76c74d3ab9..d79f89a97bde0a4435188ec544780b42742f9424 100644
--- a/Tools/Scripts/webkitpy/layout_tests/port/port_testcase.py
+++ b/Tools/Scripts/webkitpy/layout_tests/port/port_testcase.py
@@ -129,9 +129,17 @@ class PortTestCase(unittest.TestCase):
                             test_run_results.UNEXPECTED_ERROR_EXIT_STATUS)
         finally:
             out, err, logs = oc.restore_output()
-            self.assertIn('pretty patches', logs)        # And, hereere we should get warnings about both.
+            self.assertIn('pretty patches', logs)        # And, here we should get warnings about both.
             self.assertIn('build requirements', logs)
 
+    def test_default_batch_size(self):
+        port = self.make_port()
+
+        # Test that we set a finite batch size for sanitizer builds.
+        port._options.enable_sanitizer = True
+        sanitized_batch_size = port.default_batch_size()
+        self.assertIsNotNone(sanitized_batch_size)
+
     def test_default_child_processes(self):
         port = self.make_port()
         num_workers = port.default_child_processes()