Expose br tag in AX Tree as ROLE_SYSTEM_WHITESPACE.

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 296 matching lines @@
     case blink::WebAXRoleTreeGrid:
       return ui::AX_ROLE_TREE_GRID;
     case blink::WebAXRoleTreeItem:
       return ui::AX_ROLE_TREE_ITEM;
     case blink::WebAXRoleUnknown:
       return ui::AX_ROLE_UNKNOWN;
     case blink::WebAXRoleUserInterfaceTooltip:
       return ui::AX_ROLE_TOOLTIP;
     case blink::WebAXRoleWebArea:
       return ui::AX_ROLE_WEB_AREA;
+    case blink::WebAXRoleLineBreak:
+      return ui::AX_ROLE_LINE_BREAK;
     case blink::WebAXRoleWindow:
       return ui::AX_ROLE_WINDOW;
     default:
       // We can't add an assertion here, that prevents us
       // from adding new role enums in Blink.
       LOG(WARNING) << "Warning: Blink WebAXRole " << role
                    << " not handled by Chromium yet.";
       return ui::AX_ROLE_UNKNOWN;
   }
 }
@@ skipping 65 matching lines @@
     case blink::WebAXTextDirectionBT:
       return ui::AX_TEXT_DIRECTION_BT;
     default:
       NOTREACHED();
   }
 
   return ui::AX_TEXT_DIRECTION_NONE;
 }
 
 }  // namespace content