For anyone looking for the answer I got it to work using
string[] args = { "document.title;" };
string foo = await webView.InvokeScriptAsync("eval", args);
Question
In Windows Phone 8 you could use:
(string)browser.InvokeScript("eval", "document.title.toString()");
to return page title from browser.
How would you go about doing this in the new WP8.1's API
La solution
For anyone looking for the answer I got it to work using
string[] args = { "document.title;" };
string foo = await webView.InvokeScriptAsync("eval", args);
Autres conseils
InvokeScript is still supported in silverlight for windows phone 8.1