Create test expectations line automatically from failing test results

third_party/WebKit/Tools/Scripts/update-w3c-test-expections

Index: third_party/WebKit/Tools/Scripts/update-w3c-test-expections
diff --git a/third_party/WebKit/Tools/Scripts/update-w3c-test-expections b/third_party/WebKit/Tools/Scripts/update-w3c-test-expections
new file mode 100755
index 0000000000000000000000000000000000000000..3bb94275c64f3a4e7c3c76029ef4ba5a9f0d8a7c
--- /dev/null
+++ b/third_party/WebKit/Tools/Scripts/update-w3c-test-expections
@@ -0,0 +1,18 @@
+#!/usr/bin/env python
+# Copyright 2016 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.
+
+import sys
+
+from webkitpy.common import host
+from webkitpy.common.checkout.scm.git import Git
+from webkitpy.w3c.update_w3c_test_expectations import main
+
+if __name__ == "__main__":
+    _host = host.Host()
+    _host._scm = Git('.')

[qyearsley, 2016/07/18 22:55:28]

It might also work if you call host.initialize_scm() here -- in practice, I
believe this should always set up a Git object as long as the current working
directory is in a git repo.

+    _port = _host.port_factory.get()

[qyearsley, 2016/07/18 22:55:28]

No need to use underscores here, since these are local variables, not attributes
of a class.

+    return_code = main(_host, _port)
+
+sys.exit(return_code)