2017-09-21  Carlos Garcia Campos  <cgarcia@igalia.com>

        WebDriver: Add support to import and run W3C tests
        https://bugs.webkit.org/show_bug.cgi?id=177304

        Reviewed by Brian Burg.

        Add json file used by the importer and the result of running the importer.

        * imported/w3c/importer.json: Added.
        * imported/w3c/tools/pytest/: Added.
        * imported/w3c/tools/webdriver/: Added.
        * imported/w3c/tools/wptrunner/: Added.
        * imported/w3c/webdriver/: Added.