Allow expected.txt files in testharness LayoutTests with console errors

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

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Utility module for testharness."""
 
 
 # const definitions
 TESTHARNESSREPORT_HEADER = 'This is a testharness.js-based test.'
 TESTHARNESSREPORT_FOOTER = 'Harness: the test ran to completion.'
@@ skipping 61 matching lines @@
         if line.startswith('FAIL') or \
            line.startswith('TIMEOUT') or \
            line.startswith('NOTRUN') or \
            line.startswith('Harness Error. harness_status = '):
             return False
 
         # Unexpected output should be considered as a failure.
         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