a11y: Exclude children of nested keyboard accessible controls from a11y tree.

ui/accessibility/platform/ax_platform_node_auralinux.cc

 // Copyright 2015 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 "ui/accessibility/platform/ax_platform_node_auralinux.h"
 
 #include <stdint.h>
 
 #include "base/command_line.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 405 matching lines @@
     case ui::AX_ROLE_BUTTON:
       return ATK_ROLE_PUSH_BUTTON;
     case ui::AX_ROLE_CHECK_BOX:
       return ATK_ROLE_CHECK_BOX;
     case ui::AX_ROLE_COMBO_BOX:
       return ATK_ROLE_COMBO_BOX;
     case ui::AX_ROLE_DIALOG:
       return ATK_ROLE_DIALOG;
     case ui::AX_ROLE_GROUP:
       return ATK_ROLE_PANEL;
+    case ui::AX_ROLE_IGNORED:
+      return ATK_ROLE_REDUNDANT_OBJECT;
     case ui::AX_ROLE_IMAGE:
       return ATK_ROLE_IMAGE;
     case ui::AX_ROLE_MENU_ITEM:
       return ATK_ROLE_MENU_ITEM;
     case ui::AX_ROLE_SCROLL_BAR:
       return ATK_ROLE_SCROLL_BAR;
     case ui::AX_ROLE_SLIDER:
       return ATK_ROLE_SLIDER;
     case ui::AX_ROLE_SPLITTER:
       return ATK_ROLE_SEPARATOR;
@@ skipping 131 matching lines @@
 
 void AXPlatformNodeAuraLinux::GetSize(gint* width, gint* height) {
   gfx::Rect rect_size = gfx::ToEnclosingRect(GetData().location);
   if (width)
     *width = rect_size.width();
   if (height)
     *height = rect_size.height();
 }
 
 }  // namespace ui