Clean patch with DCC static content

chrome/common/extensions/docs/static/js/scroll.js

-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Scroll handling.
-//
-// Switches the sidebar between floating on the left and position:fixed
-// depending on whether it's scrolled into view, and manages the scroll-to-top
-// button: click logic, and when to show it.
-(function() {
-
-var sidebar = document.getElementById('gc-sidebar');
-var scrollToTop = document.getElementById('scroll-to-top');
-var offsetTop = sidebar.offsetTop;
-
-function relayout() {
-  // Obviously, this code executes every time the window scrolls, so avoid
-  // putting things in here.
-  var isFloatingSidebar = sidebar.classList.contains('floating');
-  var isShowingScrollToTop = !scrollToTop.classList.contains('hidden');
-
-  var floatSidebar = false;
-  var showScrollToTop = false;
-
-  if (window.scrollY > offsetTop) {
-    // Scrolled past the top of the sidebar.
-    if (window.innerHeight >= sidebar.scrollHeight) {
-      // The whole sidebar fits in the window. Make it always visible.
-      floatSidebar = true;
-    } else {
-      // Whole sidebar doesn't fit, so show the scroll-to-top button instead.
-      showScrollToTop = true;
-    }
-  }
-
-  if (floatSidebar != isFloatingSidebar)
-    sidebar.classList.toggle('floating', floatSidebar);
-  if (isShowingScrollToTop != showScrollToTop)
-    scrollToTop.classList.toggle('hidden', !showScrollToTop);
-}
-
-window.addEventListener('scroll', relayout);
-setTimeout(relayout, 0);
-
-scrollToTop.addEventListener('click', function() {
-  window.scrollTo(0, 0);
-});
-
-}());