

<link rel="import" href="../polymer/polymer.html">
<link rel="import" href="../iron-behaviors/iron-button-state.html">

<script>

  /**
   * `Polymer.PaperInkyFocusBehavior` implements a ripple when the element has keyboard focus.
   *
   * @polymerBehavior Polymer.PaperInkyFocusBehavior
   */
  Polymer.PaperInkyFocusBehaviorImpl = {

    observers: [
      '_focusedChanged(receivedFocusFromKeyboard)'
    ],

    _focusedChanged: function(receivedFocusFromKeyboard) {
      if (!this.$.ink) {
        retur