Push Authenticator Pro for iOS/Android
Push Authenticator Pro uses push messaging for two-factor authentication.
Chrome Extension allows you to send push requests to iOS/Android app. You'll get push message from iOS/Android app and send two-factor authentication codes to the Chrome.
YouTube video:
https://www.youtube.com/watch?v=3TVLOAknvrI
iOS app and Android app is available from https://bit.ly/pap-install .