Introduce WPTServe for running W3C Blink Layout tests

Tools/Scripts/webkitpy/thirdparty/wpt/wpt/tools/sslutils/pregenerated.py

+class PregeneratedSSLEnvironment(object):
+    """SSL environment to use with existing key/certificate files
+    e.g. when running on a server with a public domain name
+    """
+    ssl_enabled = True
+
+    def __init__(self, logger, host_key_path, host_cert_path,
+                 ca_cert_path=None):
+        self._ca_cert_path = ca_cert_path
+        self._host_key_path = host_key_path
+        self._host_cert_path = host_cert_path
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, *args, **kwargs):
+        pass
+
+    def host_cert_path(self, hosts):
+        """Return the key and certificate paths for the host"""
+        return self._host_key_path, self._host_cert_path
+
+    def ca_cert_path(self):
+        """Return the certificate path of the CA that signed the
+        host certificates, or None if that isn't known"""
+        return self._ca_cert_path