Ignore a11y failures in extension browser_tests that enter dev mode.

chrome/browser/ui/webui/extensions/extension_settings_browsertest.js

 // Copyright (c) 2012 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.
 
 // TODO(dbeam): test for loading upacked extensions?
 
 GEN('#include "chrome/browser/ui/webui/extensions/' +
     'extension_settings_browsertest.h"');
 
 // chrome/test/data/extensions/good.crx's extension ID. good.crx is loaded by
@@ skipping 70 matching lines @@
    * @protected
    * */
   waitForPageLoad: function() {
     assertEquals(this.browsePreload, document.location.href);
     var extensionList = getRequiredElement('extension-settings-list');
     extensionList.loadFinished.then(this.nextStep.bind(this));
   },
 
   /** @protected */
   verifyDeveloperModeWorks: function() {
+    this.ignoreDevModeA11yFailures();
     var extensionSettings = getRequiredElement('extension-settings');
     assertFalse(extensionSettings.classList.contains('dev-mode'));
     $('toggle-dev-on').click();
     assertTrue(extensionSettings.classList.contains('dev-mode'));
     chrome.developerPrivate.getProfileConfiguration(function(profileInfo) {
       assertTrue(profileInfo.inDeveloperMode);
 
       // A 0ms timeout is necessary so that all the transitions can finish.
       window.setTimeout(this.nextStep.bind(this), 0);
     }.bind(this));
   },
 
   /** @protected */
   testDeveloperMode: function() {
     var next = this.nextStep.bind(this);
     var checkDevModeIsOff = function() {
       chrome.developerPrivate.getProfileConfiguration(function(profileInfo) {
         assertFalse(profileInfo.inDeveloperMode);
         next();
       });
     };
     this.steps = [this.waitForPageLoad,
                   checkDevModeIsOff,
                   this.verifyDeveloperModeWorks,
                   testDone];
     this.nextStep();
-  }
+  },
+
+  /**
+   * TODO(hcarmona): Remove this as part of fixing crbug.com/463245.
+   * Will ignore accessibility failures caused by the transition when developer
+   * mode is enabled.

[Devlin, 2015/04/27 15:49:24]

nit: I'd comment on why we ignore it, and why it's probably okay (and maybe do
the same briefly in the CL description).  (i.e., it fails because of an overlap,
but that overlap is only true during a short transition, so by the end it would
pass, if it could).

+   * @protected
+   */
+  ignoreDevModeA11yFailures: function() {
+    this.accessibilityAuditConfig.ignoreSelectors(
+          'focusableElementNotVisibleAndNotAriaHidden',
+          '#load-unpacked');
+    this.accessibilityAuditConfig.ignoreSelectors(
+          'focusableElementNotVisibleAndNotAriaHidden',
+          '#pack-extension');
+    this.accessibilityAuditConfig.ignoreSelectors(
+          'focusableElementNotVisibleAndNotAriaHidden',
+          '#update-extensions-now');
+  },
 };
 
 // Verify that developer mode doesn't change behavior when the number of
 // extensions changes.
 TEST_F('ExtensionSettingsWebUITest', 'testDeveloperModeNoExtensions',
        function() {
   this.testDeveloperMode();
 });
 
 TEST_F('ExtensionSettingsWebUITest', 'testEmptyExtensionList', function() {
@@ skipping 255 matching lines @@
 
   /** @override */
   browsePreload: ExtensionSettingsWebUITest.prototype.browsePreload +
       '?options=' + GOOD_CRX_ID,
 };
 
 TEST_F('OptionsDialogExtensionSettingsWebUITest', 'testAccessibility',
        function() {
   this.emptyTestForAccessibility();
 });