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Google auth provider.

example
// Using a redirect.
firebase.auth().getRedirectResult().then(function(result) {
  if (result.credential) {
    // This gives you a Google Access Token.
    var token = result.credential.accessToken;
  }
  var user = result.user;
});

// Start a sign in process for an unauthenticated user.
var provider = new firebase.auth.GoogleAuthProvider();
provider.addScope('profile');
provider.addScope('email');
firebase.auth().signInWithRedirect(provider);
example
// Using a popup.
var provider =