Revamp the Incognito NTP on Desktop

chrome/browser/resources/ntp4/md_incognito_tab.js

+// Copyright 2017 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.
+
+// Handle the bookmark bar and theme change requests from the C++ side.
+var ntp = {
+  /** @param {string} attached */
+  setBookmarkBarAttached: function(attached) {
+    document.documentElement.setAttribute('bookmarkbarattached', attached);
+  },
+
+  /** @param {!{hasCustomBackground: boolean}} themeData */
+  themeChanged: function(themeData) {
+    document.documentElement.setAttribute('hascustombackground',
+                                          themeData.hasCustomBackground);
+    $('incognitothemecss').href =
+        'chrome://theme/css/incognito_new_tab_theme.css?' + Date.now();
+  },
+};
+
+// Let the width of two lists of bulletpoints in a horizontal alignment
+// determine the maximum content width.
+window.addEventListener('load', function() {
+  var bulletpoints = document.querySelectorAll('.bulletpoints');
+  var content = document.querySelector('.content');
+
+  var maxWidth = (bulletpoints[0].offsetWidth + bulletpoints[1].offsetWidth +
+      40 /* margin */ + 2 /* offsetWidths may be rounded down */);
+
+  // Limit the maximum width to 600px. That might force the two lists
+  // of bulletpoints under each other, in which case we must swap the left
+  // and right margin.
+  if (maxWidth > 600) {
+    maxWidth = 600;
+
+    bulletpoints[1].classList.add('tooWide');
+  }
+
+  content.style.maxWidth = maxWidth + "px";
+});