Polymer: Remove unused app-layout element

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

-Polymer.AppLayout = Polymer.AppLayout || {};
-
-  Polymer.AppLayout._scrollEffects = Polymer.AppLayout._scrollEffects || {};
-
-  Polymer.AppLayout.scrollTimingFunction = function easeOutQuad(t, b, c, d) {
-    t /= d;
-    return -c * t*(t-2) + b;
-  };
-
-  /**
-   * Registers a scroll effect to be used in elements that implement the
-   * `Polymer.AppScrollEffectsBehavior` behavior.
-   *
-   * @param {string} effectName The effect name.
-   * @param {Object} effectDef The effect definition.
-   */
-  Polymer.AppLayout.registerEffect = function registerEffect(effectName, effectDef) {
-    if (Polymer.AppLayout._scrollEffects[effectName] != null) {
-      throw new Error('effect `'+ effectName + '` is already registered.');
-    }
-    Polymer.AppLayout._scrollEffects[effectName] = effectDef;
-  };
-
-  /**
-   * Scrolls to a particular set of coordinates in a scroll target.
-   * If the scroll target is not defined, then it would use the main document as the target.
-   *
-   * To scroll in a smooth fashion, you can set the option `behavior: 'smooth'`. e.g.
-   *
-   * ```js
-   * Polymer.AppLayout.scroll({top: 0, behavior: 'smooth'});
-   * ```
-   *
-   * To scroll in a silent mode, without notifying scroll changes to any app-layout elements,
-   * you can set the option `behavior: 'silent'`. This is particularly useful we you are using
-   * `app-header` and you desire to scroll to the top of a scrolling region without running
-   * scroll effects. e.g.
-   *
-   * ```js
-   * Polymer.AppLayout.scroll({top: 0, behavior: 'silent'});
-   * ```
-   *
-   * @param {Object} options {top: Number, left: Number, behavior: String(smooth | silent)}
-   */
-  Polymer.AppLayout.scroll = function scroll(options) {
-    options = options || {};
-
-    var docEl = document.documentElement;
-    var target = options.target || docEl;
-    var hasNativeScrollBehavior = 'scrollBehavior' in target.style && target.scroll;
-    var scrollClassName = 'app-layout-silent-scroll';
-    var scrollTop = options.top || 0;
-    var scrollLeft = options.left || 0;
-    var scrollTo = target === docEl ? window.scrollTo :
-      function scrollTo(scrollLeft, scrollTop) {
-        target.scrollLeft = scrollLeft;
-        target.scrollTop = scrollTop;
-      };
-
-    if (options.behavior === 'smooth') {
-
-      if (hasNativeScrollBehavior) {
-
-        target.scroll(options);
-
-      } else {
-
-        var timingFn = Polymer.AppLayout.scrollTimingFunction;
-        var startTime = Date.now();
-        var currentScrollTop = target === docEl ? window.pageYOffset : target.scrollTop;
-        var currentScrollLeft = target === docEl ? window.pageXOffset : target.scrollLeft;
-        var deltaScrollTop = scrollTop - currentScrollTop;
-        var deltaScrollLeft = scrollLeft - currentScrollLeft;
-        var duration = 300;
-        var updateFrame = (function updateFrame() {
-          var now = Date.now();
-          var elapsedTime = now - startTime;
-
-          if (elapsedTime < duration) {
-            scrollTo(timingFn(elapsedTime, currentScrollLeft, deltaScrollLeft, duration),
-                timingFn(elapsedTime, currentScrollTop, deltaScrollTop, duration));
-            requestAnimationFrame(updateFrame);
-          } else {
-            scrollTo(scrollLeft, scrollTop);
-          }
-        }).bind(this);
-        
-        updateFrame();
-      }
-
-    } else if (options.behavior === 'silent') {
-
-      docEl.classList.add(scrollClassName);
-
-      // Browsers keep the scroll momentum even if the bottom of the scrolling content
-      // was reached. This means that calling scroll({top: 0, behavior: 'silent'}) when
-      // the momentum is still going will result in more scroll events and thus scroll effects.
-      // This seems to only apply when using document scrolling.
-      // Therefore, when should we remove the class from the document element?
-
-      clearInterval(Polymer.AppLayout._scrollTimer);
-
-      Polymer.AppLayout._scrollTimer = setTimeout(function() {
-        docEl.classList.remove(scrollClassName);
-        Polymer.AppLayout._scrollTimer = null;
-      }, 100);
-
-      scrollTo(scrollLeft, scrollTop);
-
-    } else {
-
-      scrollTo(scrollLeft, scrollTop);
-
-    }
-  };