Correctly map list markers to a specific role rather than a generic group on Mac.

content/browser/accessibility/browser_accessibility_cocoa.mm

 // 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.
 
 #include <execinfo.h>
 
 #import "content/browser/accessibility/browser_accessibility_cocoa.h"
 
 #include <map>
 
@@ skipping 120 matching lines @@
     { WebAccessibility::ROLE_LANDMARK_APPLICATION, NSAccessibilityGroupRole },
     { WebAccessibility::ROLE_LANDMARK_BANNER, NSAccessibilityGroupRole },
     { WebAccessibility::ROLE_LANDMARK_COMPLEMENTARY, NSAccessibilityGroupRole },
     { WebAccessibility::ROLE_LANDMARK_CONTENTINFO, NSAccessibilityGroupRole },
     { WebAccessibility::ROLE_LANDMARK_MAIN, NSAccessibilityGroupRole },
     { WebAccessibility::ROLE_LANDMARK_NAVIGATION, NSAccessibilityGroupRole },
     { WebAccessibility::ROLE_LANDMARK_SEARCH, NSAccessibilityGroupRole },
     { WebAccessibility::ROLE_LINK, NSAccessibilityLinkRole },
     { WebAccessibility::ROLE_LIST, NSAccessibilityListRole },
     { WebAccessibility::ROLE_LIST_ITEM, NSAccessibilityGroupRole },
-    { WebAccessibility::ROLE_LIST_MARKER, NSAccessibilityGroupRole },
+    { WebAccessibility::ROLE_LIST_MARKER, @"AXListMarker" },
     { WebAccessibility::ROLE_LISTBOX, NSAccessibilityListRole },
     { WebAccessibility::ROLE_LISTBOX_OPTION, NSAccessibilityGroupRole },
     { WebAccessibility::ROLE_LOG, NSAccessibilityGroupRole },
     { WebAccessibility::ROLE_MARQUEE, NSAccessibilityGroupRole },
     { WebAccessibility::ROLE_MATH, NSAccessibilityGroupRole },
     { WebAccessibility::ROLE_MATTE, NSAccessibilityMatteRole },
     { WebAccessibility::ROLE_MENU, NSAccessibilityMenuRole },
     { WebAccessibility::ROLE_MENU_ITEM, NSAccessibilityMenuItemRole },
     { WebAccessibility::ROLE_MENU_BUTTON, NSAccessibilityButtonRole },
     { WebAccessibility::ROLE_MENU_LIST_OPTION, NSAccessibilityMenuItemRole },
@@ skipping 883 matching lines @@
     return [super hash];
   return browserAccessibility_->renderer_id();
 }
 
 - (BOOL)accessibilityShouldUseUniqueId {
   return YES;
 }
 
 @end