It might be a little bit late, but I have setup a mobile platform for multiplayer games, including an invite function for opponents. The platform contains a signaling server, turn servers and a mobile app with a XWalkView for HTML5 (instead of Google's WebView). Game developers can simple post their game description, host the game anywhere or on the platform itself.
A demo of the Construct2 Multiplayer Pong is provided as well. See attached video:
(Update) As of Android 7.x XWalkView is no longer supported and generates errors, so users having Android 7.x and above installed will use Google's WebView automatically.