Roll Polymer from 1.5.0 -> 1.6.0 to pick up native CSS custom props

third_party/polymer/v1_0/components-chromium/paper-behaviors/paper-inky-focus-behavior-extracted.js

 /**
    * `Polymer.PaperInkyFocusBehavior` implements a ripple when the element has keyboard focus.
    *
    * @polymerBehavior Polymer.PaperInkyFocusBehavior
    */
   Polymer.PaperInkyFocusBehaviorImpl = {
-
     observers: [
       '_focusedChanged(receivedFocusFromKeyboard)'
     ],
 
     _focusedChanged: function(receivedFocusFromKeyboard) {
       if (receivedFocusFromKeyboard) {
         this.ensureRipple();
       }
       if (this.hasRipple()) {
         this._ripple.holdDown = receivedFocusFromKeyboard;
       }
     },
 
     _createRipple: function() {
       var ripple = Polymer.PaperRippleBehavior._createRipple();
       ripple.id = 'ink';
       ripple.setAttribute('center', '');
       ripple.classList.add('circle');
       return ripple;
     }
-
   };
 
   /** @polymerBehavior Polymer.PaperInkyFocusBehavior */
   Polymer.PaperInkyFocusBehavior = [
     Polymer.IronButtonState,
     Polymer.IronControlState,
     Polymer.PaperRippleBehavior,
     Polymer.PaperInkyFocusBehaviorImpl
   ];