Allow expected.txt files in testharness LayoutTests with console errors

Tools/Scripts/webkitpy/layout_tests/models/testharness_results_unittest.py

Index: Tools/Scripts/webkitpy/layout_tests/models/testharness_results_unittest.py
diff --git a/Tools/Scripts/webkitpy/layout_tests/models/testharness_results_unittest.py b/Tools/Scripts/webkitpy/layout_tests/models/testharness_results_unittest.py
index 6ec58cf1171d6229875fd3e70de949b629248211..c21ff9883625a5221fb9fcb37769767d29f3b912 100644
--- a/Tools/Scripts/webkitpy/layout_tests/models/testharness_results_unittest.py
+++ b/Tools/Scripts/webkitpy/layout_tests/models/testharness_results_unittest.py
@@ -44,3 +44,17 @@ class TestHarnessResultCheckerTest(unittest.TestCase):
 
         for data in test_data:
             self.assertEqual(data['result'], testharness_results.is_testharness_output_passing(data['content']))
+
+    def test_is_testharness_output_with_console_errors(self):
+        test_data = [
+            {'content': 'This is a testharness.js-based test.\nCONSOLE ERROR: This is an error.\nTest ran to completion.', 'result': True},
+            {'content': 'CONSOLE ERROR: This is an error.\nTest ran to completion.', 'result': True},
+            {'content': 'This is a testharness.js-based test.\nCONSOLE ERROR: This is an error.', 'result': True},
+            {'content': 'CONSOLE ERROR: This is an error.', 'result': True},
+            {'content': 'This is a testharness.js-based test.\nCONSOLE MESSAGE: This is not error.', 'result': False},
+            {'content': 'This is a testharness.js-based test.\nNo errors here.', 'result': False},
+            {'content': 'This is not a CONSOLE ERROR, sorry.', 'result': False},
+        ]
+
+        for data in test_data:
+            self.assertEqual(data['result'], testharness_results.is_testharness_output_with_console_errors(data['content']))