WebDriver: add support for importing and running selenium tests

WebDriver: add support for importing and running selenium tests
https://bugs.webkit.org/show_bug.cgi?id=180145

Reviewed by Brian Burg.

Tools:

We currently import and run W3C tests, which are the best ones to ensure our implementation is spec
compliant. However, the selenium API is what user will actually use in the end, so it's important to ensure that
we don't break the selenium support. This patch adds webdriver_test_runner_selenium.py and
webdriver_selenium_executor.py to run selenium tests. The script import-w3c-webdriver-tests has been renamed as
import-webdriver-tests and it can now import selenium tests too.

* Scripts/import-w3c-webdriver-tests: Removed.
* Scripts/import-webdriver-tests: Added.
(Importer):
(Importer.__init__):
(Importer.download_tests):
(Importer.import_tests):
(Importer.import_tests.should_skip_file):
* Scripts/webkitpy/webdriver_tests/webdriver_driver.py:
(WebDriver.browser_path):
(WebDriver):
(WebDriver.browser_args):
(WebDriver.selenium_name):
* Scripts/webkitpy/webdriver_tests/webdriver_driver_gtk.py:
(WebDriverGtk.browser_path):
(WebDriverGtk):
(WebDriverGtk.browser_args):
(WebDriverGtk.capabilities):
(WebDriverGtk.selenium_name):
* Scripts/webkitpy/webdriver_tests/webdriver_driver_wpe.py:
(WebDriverWPE.browser_args):
(WebDriverWPE.capabilities):
* Scripts/webkitpy/webdriver_tests/webdriver_selenium_executor.py: Added.
(_ensure_directory_in_path):
(CollectRecorder):
(CollectRecorder.__init__):
(CollectRecorder.pytest_collectreport):
(WebDriverSeleniumExecutor):
(WebDriverSeleniumExecutor.__init__):
(WebDriverSeleniumExecutor.collect):
(WebDriverSeleniumExecutor.run):
* Scripts/webkitpy/webdriver_tests/webdriver_test_runner.py:
(WebDriverTestRunner):
(WebDriverTestRunner.__init__):
(WebDriverTestRunner.run):
(WebDriverTestRunner.print_results):
(WebDriverTestRunner.dump_results_to_json_file):
* Scripts/webkitpy/webdriver_tests/webdriver_test_runner_selenium.py: Added.
(WebDriverTestRunnerSelenium):
(WebDriverTestRunnerSelenium.__init__):
(WebDriverTestRunnerSelenium._tests_dir):
(WebDriverTestRunnerSelenium.collect_tests):
(WebDriverTestRunnerSelenium.run):
(WebDriverTestRunnerSelenium.results):
* Scripts/webkitpy/webdriver_tests/webdriver_test_runner_w3c.py:
(WebDriverTestRunnerW3C.__init__):
(WebDriverTestRunnerW3C.run):
* Scripts/webkitpy/webdriver_tests/webdriver_w3c_executor.py:

WebDriverTests:

* imported/selenium/importer.json: Added.
* imported/selenium/common/: Added.
* imported/selenium/py/: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@225390 268f45cc-cd09-0410-ab3c-d52691b4dbfc