Expose correct semantics for HTML5 footer element on mac and windows platforms, as per https://bugs…

content/browser/accessibility/browser_accessibility_win.cc

 // 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 "content/browser/accessibility/browser_accessibility_win.h"
 
 #include <UIAutomationClient.h>
 #include <UIAutomationCoreApi.h>
 
 #include "base/string_number_conversions.h"
@@ skipping 3091 matching lines @@
     case WebAccessibility::ROLE_WEB_AREA:
       ia_role_ = ROLE_SYSTEM_DOCUMENT;
       ia_state_|= STATE_SYSTEM_READONLY;
       ia_state_|= STATE_SYSTEM_FOCUSABLE;
       break;
     case WebAccessibility::ROLE_EDITABLE_TEXT:
       ia_role_ = ROLE_SYSTEM_TEXT;
       ia2_state_ |= IA2_STATE_SINGLE_LINE;
       ia2_state_ |= IA2_STATE_EDITABLE;
       break;
+    case WebAccessibility::ROLE_FOOTER:
+      ia_role_ = IA2_ROLE_FOOTER;
+      ia_state_|= STATE_SYSTEM_READONLY;
+      break;
     case WebAccessibility::ROLE_GRID:
       ia_role_ = ROLE_SYSTEM_TABLE;
       ia_state_|= STATE_SYSTEM_READONLY;
       break;
     case WebAccessibility::ROLE_GROUP: {
       string16 aria_role;
       GetStringAttribute(WebAccessibility::ATTR_ROLE, &aria_role);
       if (aria_role == L"group" || html_tag == L"fieldset") {
         ia_role_ = ROLE_SYSTEM_GROUPING;
       } else if (html_tag == L"li") {
@@ skipping 250 matching lines @@
   }
 
   // The role should always be set.
   DCHECK(!role_name_.empty() || ia_role_);
 
   // If we didn't explicitly set the IAccessible2 role, make it the same
   // as the MSAA role.
   if (!ia2_role_)
     ia2_role_ = ia_role_;
 }