uld use this animation in an `entry` animation and set the
`toPage` configuration property to itself. They should also define the hero elements in the
`sharedElements` property (not a configuration property, see
`Polymer.NeonSharedElementAnimatableBehavior`).

Configuration:
```
{
  name: 'hero-animation',
  id: <shared-element-id>,
  timing: <animation-timing>,
  toPage: <node>, /* define for the destination page */
  fromPage: <node>, /* define for the source page */
}
```
-->

<script>

  Polymer({

    