Enable a11y audit for chrome://settings

chrome/browser/ui/webui/options/options_browsertest_base.js

+// Copyright (c) 2014 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.
+
+/**
+ * @constructor
+ * @extends {testing.Test}
+ */
+function OptionsBrowsertestBase() {}
+
+OptionsBrowsertestBase.prototype = {
+  __proto__: testing.Test.prototype,
+
+  /** @override */
+  runAccessibilityChecks: true,
+
+  /** @override */
+  accessibilityIssuesAreErrors: true,
+
+  /** @override */
+  setUp: function() {
+    // user-image-stream is a streaming video element used for capturing a
+    // user image during OOBE.
+    this.accessibilityAuditConfig.ignoreSelectors('videoWithoutCaptions',
+                                                  '.user-image-stream');
+  },
+};