Unreviewed. Update W3C WebDriver imported tests.

Unreviewed. Update W3C WebDriver imported tests.

* imported/w3c/importer.json:
* imported/w3c/tools/webdriver/webdriver/client.py:
* imported/w3c/tools/webdriver/webdriver/error.py:
* imported/w3c/tools/webdriver/webdriver/protocol.py: Added.
* imported/w3c/tools/webdriver/webdriver/transport.py:
* imported/w3c/tools/wptrunner/MANIFEST.in:
* imported/w3c/tools/wptrunner/requirements_firefox.txt:
* imported/w3c/tools/wptrunner/requirements_opera.txt: Added.
* imported/w3c/tools/wptrunner/wptrunner/browsers/__init__.py:
* imported/w3c/tools/wptrunner/wptrunner/browsers/edge.py:
* imported/w3c/tools/wptrunner/wptrunner/browsers/firefox.py:
* imported/w3c/tools/wptrunner/wptrunner/browsers/opera.py: Added.
* imported/w3c/tools/wptrunner/wptrunner/environment.py:
* imported/w3c/tools/wptrunner/wptrunner/executors/base.py:
* imported/w3c/tools/wptrunner/wptrunner/executors/executoredge.py: Added.
* imported/w3c/tools/wptrunner/wptrunner/executors/executormarionette.py:
* imported/w3c/tools/wptrunner/wptrunner/executors/executoropera.py: Added.
* imported/w3c/tools/wptrunner/wptrunner/executors/executorselenium.py:
* imported/w3c/tools/wptrunner/wptrunner/executors/pytestrunner/runner.py:
* imported/w3c/tools/wptrunner/wptrunner/executors/testharness_webdriver.js:
* imported/w3c/tools/wptrunner/wptrunner/executors/testharness_webdriver_resume.js: Added.
* imported/w3c/tools/wptrunner/wptrunner/stability.py: Added.
* imported/w3c/tools/wptrunner/wptrunner/testdriver-extra.js: Added.
* imported/w3c/tools/wptrunner/wptrunner/testloader.py:
* imported/w3c/tools/wptrunner/wptrunner/testrunner.py:
* imported/w3c/tools/wptrunner/wptrunner/update/state.py:
* imported/w3c/tools/wptrunner/wptrunner/update/sync.py:
* imported/w3c/tools/wptrunner/wptrunner/webdriver_server.py:
* imported/w3c/tools/wptrunner/wptrunner/wptcommandline.py:
* imported/w3c/tools/wptrunner/wptrunner/wptlogging.py:
* imported/w3c/tools/wptrunner/wptrunner/wptrunner.py:
* imported/w3c/tools/wptrunner/wptrunner/wpttest.py:
* imported/w3c/webdriver/tests/actions/conftest.py:
* imported/w3c/webdriver/tests/actions/key.py:
* imported/w3c/webdriver/tests/actions/key_shortcuts.py: Added.
* imported/w3c/webdriver/tests/actions/modifier_click.py: Added.
* imported/w3c/webdriver/tests/actions/mouse.py:
* imported/w3c/webdriver/tests/actions/sequence.py:
* imported/w3c/webdriver/tests/actions/special_keys.py:
* imported/w3c/webdriver/tests/actions/support/keys.py:
* imported/w3c/webdriver/tests/actions/support/test_actions_wdspec.html:
* imported/w3c/webdriver/tests/cookies/add_cookie.py:
* imported/w3c/webdriver/tests/cookies/get_named_cookie.py:
* imported/w3c/webdriver/tests/element_click/stale.py: Added.
* imported/w3c/webdriver/tests/element_retrieval/get_active_element.py:
* imported/w3c/webdriver/tests/interaction/element_clear.py: Added.
* imported/w3c/webdriver/tests/navigation/get_title.py:
* imported/w3c/webdriver/tests/retrieval/find_element.py:
* imported/w3c/webdriver/tests/retrieval/find_element_from_element.py:
* imported/w3c/webdriver/tests/retrieval/find_element_from_elements.py:
* imported/w3c/webdriver/tests/retrieval/find_elements.py:
* imported/w3c/webdriver/tests/sessions/new_session/support/__init__.py:
* imported/w3c/webdriver/tests/state/get_element_attribute.py:
* imported/w3c/webdriver/tests/state/get_element_property.py:
* imported/w3c/webdriver/tests/state/get_element_tag_name.py:
* imported/w3c/webdriver/tests/state/is_element_selected.py:
* imported/w3c/webdriver/tests/support/asserts.py:
* imported/w3c/webdriver/tests/user_prompts/send_alert_text.py: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@225076 268f45cc-cd09-0410-ab3c-d52691b4dbfc