api-console-assets/bower_components/app-layout/app-scroll-effects/effects/waterfall.html

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<link rel="import" href="../app-scroll-effects-behavior.html">

<script>
  /**
   * Toggles the shadow property in app-header when content is scrolled to create a sense of depth
   * between the element and the content underneath.
   */
  Polymer.AppLayout.registerEffect('waterfall', {
    /**
     *  @this Polymer.AppLayout.ElementWithBackground
     */
    run: function run() {
      this.shadow = this.isOnScreen() && this.isContentBelow();
    }
  });
</script>