Changed parent node access to use Polymer.dom api

[taylorstine]

When adding a <paper-ripple> dynamically with React in the render method (i.e.)

let component = React.createClass({
   getInitialState: function() {
     return {addIt: false}
   }
   render: function() {
     let node = null;
     if (this.state.addIt) {
       node = <paper-ripple/>
     }
     return <div>{node}</div>
   }
   componentDidMount: function () {
       this.setState({addIt: true})
   }

})

This line gives me an error because this.parentNode is undefined.

Per these specifications I believe a better alternative is to use the Polymer.dom api.

[taylorstine]

Is anybody reviewing this?

[taylorstine]

@google ?