Added minimal ntp4 WebUI test.

chrome/test/data/webui/ntp4.js

+// Copyright (c) 2011 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.
+
+/**
+ * TestFixture for NTP4 WebUI testing.
+ * @extends {testing.Test}
+ * @constructor
+ */
+function NTP4WebUITest() {}
+
+NTP4WebUITest.prototype = {
+  __proto__: testing.Test.prototype,
+
+  /**
+   * Browse to the newtab page & call PreLoad().
+   */
+  browsePreload: 'chrome://newtab',
+};
+
+// Test loading new tab page and selecting each card doesn't have console
+// errors.
+TEST_F('NTP4WebUITest', 'TestBrowsePages', function() {
+  var cardSlider = ntp4.getCardSlider();
+  assertNotEquals(null, cardSlider);
+  for (var i = 0; i < cardSlider.cardCount; ++i) {
+    cardSlider.selectCard(i);
+    expectEquals(i, cardSlider.currentCard);
+  }
+});