TableCaptionElement is not exposed to accessibility

content/renderer/accessibility/blink_ax_enum_conversion.cc

 // Copyright (c) 2013 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/renderer/accessibility/blink_ax_enum_conversion.h"
 
 #include "base/logging.h"
 
 namespace content {
 
@@ skipping 88 matching lines @@
     case blink::WebAXRoleBanner:
       return ui::AX_ROLE_BANNER;
     case blink::WebAXRoleBlockquote:
       return ui::AX_ROLE_BLOCKQUOTE;
     case blink::WebAXRoleBusyIndicator:
       return ui::AX_ROLE_BUSY_INDICATOR;
     case blink::WebAXRoleButton:
       return ui::AX_ROLE_BUTTON;
     case blink::WebAXRoleCanvas:
       return ui::AX_ROLE_CANVAS;
+    case blink::WebAXRoleCaption:
+      return ui::AX_ROLE_CAPTION;
     case blink::WebAXRoleCell:
       return ui::AX_ROLE_CELL;
     case blink::WebAXRoleCheckBox:
       return ui::AX_ROLE_CHECK_BOX;
     case blink::WebAXRoleColorWell:
       return ui::AX_ROLE_COLOR_WELL;
     case blink::WebAXRoleColumn:
       return ui::AX_ROLE_COLUMN;
     case blink::WebAXRoleColumnHeader:
       return ui::AX_ROLE_COLUMN_HEADER;
@@ skipping 271 matching lines @@
     case blink::WebAXTextDirectionBT:
       return ui::AX_TEXT_DIRECTION_BT;
     default:
       NOTREACHED();
   }
 
   return ui::AX_TEXT_DIRECTION_NONE;
 }
 
 }  // namespace content