Limit the layout_test batch size for *SAN builds.

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

 # Copyright (C) 2010 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #    * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #    * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 111 matching lines @@
             self.assertNotIn('build requirements', logs)  # but not the driver itself.
 
         port._check_file_exists = lambda path, desc: False
         port._check_driver_build_up_to_date = lambda config: False
         try:
             oc.capture_output()
             self.assertEqual(port.check_build(needs_http=True, printer=FakePrinter()),
                             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()
         self.assertGreaterEqual(num_workers, 1)
 
         # Test that we reduce the number of workers for sanitizer builds.
         port._options.enable_sanitizer = True
         port.host.executive.cpu_count = lambda: 8
         num_sanitized_workers = port.default_child_processes()
         self.assertLess(num_sanitized_workers, 8)
@@ skipping 332 matching lines @@
     def test_additional_platform_directory(self):
         port = self.make_port(options=MockOptions(additional_platform_directory=['/tmp/foo']))
         self.assertEqual(port.baseline_search_path()[0], '/tmp/foo')
 
     def test_virtual_test_suites(self):
         # We test that we can load the real LayoutTests/VirtualTestSuites file properly, so we
         # use a real SystemHost(). We don't care what virtual_test_suites() returns as long
         # as it is iterable.
         port = self.make_port(host=SystemHost(), port_name=self.full_port_name)
         self.assertTrue(isinstance(port.virtual_test_suites(), collections.Iterable))