Something like this maybe? gchar* webkit_web_view_runtime_environment_informations(WebKitWebView*) Any more suitable name? the return value would basically be the JSON built for webkit://gpu serialized to a string. Or maybe we could return it as some JSON-glib type?
It's not a property of the web view, though, is it? I wouldn't depend on json-glib. Just returning a string is fine. How about webkit_get_debugging_information()?
The current GPU page requires a WebView, to get the hw accel policy and other things.