Make HTML5 <mark> accessible.

ui/accessibility/platform/ax_platform_node_mac.mm

 // Copyright 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.
 
 #import "ui/accessibility/platform/ax_platform_node_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/strings/sys_string_conversions.h"
 #import "ui/accessibility/ax_node_data.h"
@@ skipping 59 matching lines @@
       {ui::AX_ROLE_LABEL_TEXT, NSAccessibilityGroupRole},
       {ui::AX_ROLE_LEGEND, NSAccessibilityGroupRole},
       {ui::AX_ROLE_LINK, NSAccessibilityLinkRole},
       {ui::AX_ROLE_LIST, NSAccessibilityListRole},
       {ui::AX_ROLE_LIST_BOX, NSAccessibilityListRole},
       {ui::AX_ROLE_LIST_BOX_OPTION, NSAccessibilityStaticTextRole},
       {ui::AX_ROLE_LIST_ITEM, NSAccessibilityGroupRole},
       {ui::AX_ROLE_LIST_MARKER, @"AXListMarker"},
       {ui::AX_ROLE_LOG, NSAccessibilityGroupRole},
       {ui::AX_ROLE_MAIN, NSAccessibilityGroupRole},
+      {ui::AX_ROLE_MARK, NSAccessibilityGroupRole},
       {ui::AX_ROLE_MARQUEE, NSAccessibilityGroupRole},
       {ui::AX_ROLE_MATH, NSAccessibilityGroupRole},
       {ui::AX_ROLE_MENU, NSAccessibilityMenuRole},
       {ui::AX_ROLE_MENU_BAR, NSAccessibilityMenuBarRole},
       {ui::AX_ROLE_MENU_BUTTON, NSAccessibilityButtonRole},
       {ui::AX_ROLE_MENU_ITEM, NSAccessibilityMenuItemRole},
       {ui::AX_ROLE_MENU_ITEM_CHECK_BOX, NSAccessibilityMenuItemRole},
       {ui::AX_ROLE_MENU_ITEM_RADIO, NSAccessibilityMenuItemRole},
       {ui::AX_ROLE_MENU_LIST_OPTION, NSAccessibilityMenuItemRole},
       {ui::AX_ROLE_MENU_LIST_POPUP, NSAccessibilityUnknownRole},
@@ skipping 243 matching lines @@
 void AXPlatformNodeMac::NotifyAccessibilityEvent(ui::AXEvent event_type) {
   // TODO(dmazzoni): implement this.  http://crbug.com/396137
 }
 
 int AXPlatformNodeMac::GetIndexInParent() {
   // TODO(dmazzoni): implement this.  http://crbug.com/396137
   return -1;
 }
 
 }  // namespace ui