Polymer authentication demo... Not working for me.. .but I did some experimentation.

my-login.html

<link rel="import" href="my-app.html">
<link rel="import" href="bower_componenets/polymerfire/firebase-auth.html">
<link rel="import" href="bower_componenets/paper-button/Paper-button.html">

<dom-module id="my-login">
<template>


<firebase-auth 
        id="auth" 
        user="{{user}}" 
        status-known="{{statusKnown}}"
        provider="google" 
        on-error="handleError">
</firebase-auth>

<template is="dom-if" if="[[user]]">
<h1>Welcome [[user.displayName]]</h1>
</template>


<paper-button raised on-tap="login" hidden$="[[user]]"> Sign in</paper-button>
<paper-button raised on-tap="logout" hidden$="[[!user]]"> Sign Out</paper-button>

</template>

<script>

Polymer({
    is: 'my-login',
    properties:{
        user: {
            type: Object
        },
        statusKnown:{
            type: Object
        }
    },
    login(){
        // return this.$.auth.signInWithPopup();  //  not working.  this was original line...
            return this.$.auth.signInWithPopup()
                .then(function(response) {}) // successful authentication response here})
                .catch(function(error) {});  // unsuccessful authentication response here});
    },
    logout(){
        return this.$.auth.signOut();
    }
});


</script>
</dom-module>