Roll Polymer

third_party/polymer/v1_0/components-chromium/app-layout/app-box/app-box-extracted.js

 Polymer({
       is: 'app-box',
 
       behaviors: [
         Polymer.AppScrollEffectsBehavior,
         Polymer.IronResizableBehavior
       ],
 
       listeners: {
         'iron-resize': '_resizeHandler'
@@ skipping 63 matching lines @@
        */
       isOnScreen: function() {
         return this._elementTop < this._scrollTop + this._cachedScrollTargetHeight
             && this._elementTop + this._elementHeight > this._scrollTop;
       },
 
       _resizeHandler: function() {
         this.resetLayout();
       },
 
+      _getDOMRef: function(id) {
+        if (id === 'background') {
+          return this.$.background;
+        }
+        if (id === 'backgroundFrontLayer') {
+          return this.$.backgroundFrontLayer;
+        }
+      },
+
       /**
        * Returns an object containing the progress value of the scroll effects.
        *
        * @method getScrollState
        * @return {Object}
        */
       getScrollState: function() {
         return { progress: this._progress };
       }
     });