Update web-platform-tests and CSS tests.

- Update CSS tests to revision e05bfd5e30ed662c2f8a353577003f8eed230180.
- Update web-platform-tests to revision a052787dd5c069a340031011196b73affbd68cd9.

tests/wpt/css-tests/tools/pytest/pytest.py

@@ -0,0 +1,28 @@
+# PYTHON_ARGCOMPLETE_OK
+"""
+pytest: unit and functional testing with Python.
+"""
+__all__ = [
+    'main',
+    'UsageError',
+    'cmdline',
+    'hookspec',
+    'hookimpl',
+    '__version__',
+]
+
+if __name__ == '__main__': # if run as a script or by 'python -m pytest'
+    # we trigger the below "else" condition by the following import
+    import pytest
+    raise SystemExit(pytest.main())
+
+# else we are imported
+
+from _pytest.config import (
+    main, UsageError, _preloadplugins, cmdline,
+    hookspec, hookimpl
+)
+from _pytest import __version__
+
+_preloadplugins() # to populate pytest.* namespace so help(pytest) works
+