[webapps] Denying geolocation permission doesn’t inform the requester of the denial

Since version 0.23+14.10.20140818-0ubuntu1 (more precisely, see http://bazaar.launchpad.net/~phablet-team/webbrowser-app/trunk/revision/672), webapps delegate the geolocation permission prompt to the trust store. This is implemented by initially accepting the request to allow it to go through and actually query the location service.

If the user denies permission however, the location service doesn’t seem to inform oxide of the denial, and the page keeps waiting for a geolocation update until it eventually times out, instead of informing the user right away that geolocation is not available.

This can easily be tested by running the following on a device:

    webapp-container --desktop_file_hint=/usr/share/applications/webbrowser-app.desktop http://html5demos.com/geo

(make sure to wipe the trust store db in ~/.local/share/UbuntuLocationService/trust.db beforehand, to not use a cached answer).

I’m not sure whether the problem is in the location service itself, or in oxide.
Or is there a way for the webapp container to trigger and communicate with the trust store prompt?