Introduce WPTServe for running W3C Blink Layout tests

Tools/Scripts/webkitpy/thirdparty/wpt/wpt/tools/wptserve/wptserve/logger.py

+class NoOpLogger(object):
+    def critical(self, msg):
+        pass
+
+    def error(self, msg):
+        pass
+
+    def info(self, msg):
+        pass
+
+    def warning(self, msg):
+        pass
+
+    def debug(self, msg):
+        pass
+
+logger = NoOpLogger()
+_set_logger = False
+
+def set_logger(new_logger):
+    global _set_logger
+    if _set_logger:
+        raise Exception("Logger must be set at most once")
+    global logger
+    logger = new_logger
+    _set_logger = True
+
+def get_logger():
+    return logger