Put a copy of the wpt upstreaming scripts in-tree.

This is copied from gecko, which is slightly unfortunate. However it allows
committing changes to wpt directly in-tree and having them upstreamed in the
next update.

tests/wpt/update/updatecommandline.py

@@ -0,0 +1,40 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+def create_parser():
+    from wptrunner import wptcommandline
+
+    parser = wptcommandline.create_parser_update()
+    parser.add_argument("--upstream", dest="upstream", action="store_true", default=None,
+                        help="Push local changes to upstream repository even when not syncing")
+    parser.add_argument("--no-upstream", dest="upstream", action="store_false", default=None,
+                        help="Dont't push local changes to upstream repository when syncing")
+    parser.add_argument("--token-file", action="store", type=wptcommandline.abs_path,
+                        help="Path to file containing github token")
+    parser.add_argument("--token", action="store", help="GitHub token to use")
+    return parser
+
+
+def check_args(kwargs):
+    from wptrunner import wptcommandline
+
+    wptcommandline.set_from_config(kwargs)
+    kwargs["upstream"] = kwargs["upstream"] if kwargs["upstream"] is not None else kwargs["sync"]
+
+    if kwargs["upstream"]:
+        if kwargs["rev"]:
+            raise ValueError("Setting --rev with --upstream isn't supported")
+        if kwargs["token"] is None:
+            if kwargs["token_file"] is None:
+                raise ValueError("Must supply either a token file or a token")
+            with open(kwargs["token_file"]) as f:
+                token = f.read().strip()
+                kwargs["token"] = token
+    del kwargs["token_file"]
+    return kwargs
+
+def parse_args():
+    parser = create_parser()
+    kwargs = vars(parser.parse_args())
+    return check_args(kwargs)