This component will log you in Google and will reuse the oauth token to log you in your firebae app.
You need a firebase-app component somewhere in your app
As described in https://developers.google.com/identity/protocols/OAuth2InstalledApp your secret key is not supposed to be secret for installed apps.
You will need InAppBrowser plugin when packing your app.
<firebase-app auth-domain="your-firebase-app" database-url="your-firebase-db" api-key="your-firebase-key">
<google-firebase-login clientIdWeb="your-client-id-web" clientId="your-client-id-native" clientSecret="your-secret-key-native">
</google-firebase-login>