Add --sanitizer-mode to run-webkit-tests

Tools/Scripts/webkitpy/layout_tests/controllers/single_test_runner.py

Index: Tools/Scripts/webkitpy/layout_tests/controllers/single_test_runner.py
diff --git a/Tools/Scripts/webkitpy/layout_tests/controllers/single_test_runner.py b/Tools/Scripts/webkitpy/layout_tests/controllers/single_test_runner.py
index 9f2de4b3001b713615c3773de994dfb8949c63c2..c68f1f0733b91a9b87f53ab47bfa2dd4d215bc8a 100644
--- a/Tools/Scripts/webkitpy/layout_tests/controllers/single_test_runner.py
+++ b/Tools/Scripts/webkitpy/layout_tests/controllers/single_test_runner.py
@@ -112,6 +112,8 @@ class SingleTestRunner(object):
         return DriverInput(test_name, self._timeout, image_hash, self._should_run_pixel_test, args)
 
     def run(self):
+        if self._options.enable_sanitizer:
+            return self._run_sanitized_test()
         if self._reference_files:
             if self._options.reset_results:
                 reftest_type = set([reference_file[0] for reference_file in self._reference_files])
@@ -123,6 +125,16 @@ class SingleTestRunner(object):
             return self._run_rebaseline()
         return self._run_compare_test()
 
+    def _run_sanitized_test(self):
+        # running a sanitized test means that we ignore the actual test output and just look
+        # for timeouts and crashes (real or forced by the driver). Most crashes should
+        # indicate problems found by a sanitizer (ASAN, LSAN, etc.), but we will report
+        # on other crashes and timeouts as well in order to detect at least *some* basic failures.
+        driver_output = self._driver.run_test(self._driver_input(), self._stop_when_done)
+        failures = self._handle_error(driver_output)
+        return TestResult(self._test_name, failures, driver_output.test_time, driver_output.has_stderr(),
+                          pid=driver_output.pid)
+
     def _run_compare_test(self):
         driver_output = self._driver.run_test(self._driver_input(), self._stop_when_done)
         expected_driver_output = self._expected_driver_output()