Allow expected.txt files in testharness LayoutTests with console errors

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

Index: Tools/Scripts/webkitpy/layout_tests/models/testharness_results.py
diff --git a/Tools/Scripts/webkitpy/layout_tests/models/testharness_results.py b/Tools/Scripts/webkitpy/layout_tests/models/testharness_results.py
index 9bc87a8f585675c0c420448782caf66fbef4a423..570074c4afcc9e89a1e0969b40bb8a7d1af7b2f9 100644
--- a/Tools/Scripts/webkitpy/layout_tests/models/testharness_results.py
+++ b/Tools/Scripts/webkitpy/layout_tests/models/testharness_results.py
@@ -79,3 +79,20 @@ def is_testharness_output_passing(content_text):
         return False
 
     return True
+
+
+def is_testharness_output_with_console_errors(content_text):
+    """
+    Returns whether the content_text in parameter is a testharness output with
+    console errors.
+
+    Note:
+        It is expected that the |content_text| is a testharness output.
+    """
+
+    lines = content_text.strip().splitlines()
+    for line in lines:
+        if line.startswith('CONSOLE ERROR:'):
+            return True
+
+    return False