WebAutomationSession.cpp buildObjectForCookie does not expose the sameSite property of WebCore::Cookie. This makes 2 selenium tests to fail as the response does not include it. webkitpy.webdriver_tests.webdriver_test_runner: [INFO] imported/selenium/py/test/selenium/webdriver/common/cookie_tests.py::testAddCookieSameSiteStrict[WebKitGTK] webkitpy.webdriver_tests.webdriver_test_runner: [INFO] imported/selenium/py/test/selenium/webdriver/common/cookie_tests.py::testAddCookieSameSiteLax[WebKitGTK]