[Blink] Adding Writing direction to the context menu for linux gtk

public/web/WebContextMenuData.h

 /*
  * Copyright (C) 2009, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 119 matching lines @@
     bool isEditable;
 
     enum CheckableMenuItemFlags {
         CheckableMenuItemDisabled = 0x0,
         CheckableMenuItemEnabled = 0x1,
         CheckableMenuItemChecked = 0x2,
     };
 
     // Writing direction menu items - values are unions of
     // CheckableMenuItemFlags.
-    // Currently only used on OS X.
+    // Currently only used on OS X and Linux.
     int writingDirectionDefault;
     int writingDirectionLeftToRight;
     int writingDirectionRightToLeft;
 
     enum EditFlags {
         CanDoNone = 0x0,
         CanUndo = 0x1,
         CanRedo = 0x2,
         CanCut = 0x4,
         CanCopy = 0x8,
@@ skipping 27 matching lines @@
         , isEditable(false)
         , writingDirectionDefault(CheckableMenuItemDisabled)
         , writingDirectionLeftToRight(CheckableMenuItemEnabled)
         , writingDirectionRightToLeft(CheckableMenuItemEnabled)
         , editFlags(0) { }
 };
 
 } // namespace blink
 
 #endif