webkit: provide port name as run info (#13862)

For the WebKit product, include the port name inside the run info, under the
'webkit_port' key. This will come in handy when disabling tests in metadata files
for specific ports.

tools/wptrunner/wptrunner/browsers/webkit.py

@@ -15,7 +15,8 @@
                               "wdspec": "WebKitDriverWdspecExecutor"},
                  "executor_kwargs": "executor_kwargs",
                  "env_extras": "env_extras",
-                 "env_options": "env_options"}
+                 "env_options": "env_options",
+                 "run_info_extras": "run_info_extras"}
 
 
 def check_args(**kwargs):
@@ -69,6 +70,10 @@ def env_options():
     return {}
 
 
+def run_info_extras(**kwargs):
+    return {"webkit_port": kwargs["webkit_port"]}
+
+
 class WebKitBrowser(Browser):
     """Generic WebKit browser is backed by WebKit's WebDriver implementation,
     which is supplied through ``wptrunner.webdriver.WebKitDriverServer``.