Bug 1616729 - Show top window's document origin to users when requesting media device permissions. r=geckoview-reviewers,johannh,agi

This is similar to what we do on desktop.

Differential Revision: https://phabricator.services.mozilla.com/D92239

mobile/android/components/geckoview/GeckoViewPermission.jsm

@@ -137,7 +137,7 @@ class GeckoViewPermission {
         }
 
         const dispatcher = GeckoViewUtils.getDispatcherForWindow(win);
-        const uri = win.document.documentURIObject;
+        const uri = win.top.document.documentURIObject;
         return dispatcher
           .sendRequestForResult({
             type: "GeckoView:MediaPermission",