Support author Shadow DOM for INPUT elements

Source/core/html/HTMLTextAreaElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 49 matching lines @@
 
     void setCols(int);
     void setRows(int);
 
 private:
     HTMLTextAreaElement(const QualifiedName&, Document&, HTMLFormElement*);
 
     enum WrapMethod { NoWrap, SoftWrap, HardWrap };
 
     virtual void didAddUserAgentShadowRoot(ShadowRoot*) OVERRIDE;
+    // FIXME: Author shadows should be allowed
+    // https://bugs.webkit.org/show_bug.cgi?id=92608
+    virtual bool areAuthorShadowsAllowed() const OVERRIDE { return false; }
 
     void handleBeforeTextInsertedEvent(BeforeTextInsertedEvent*) const;
     static String sanitizeUserInputValue(const String&, unsigned maxLength);
     void updateValue() const;
     void setNonDirtyValue(const String&);
     void setValueCommon(const String&);
 
     virtual bool supportsPlaceholder() const { return true; }
     virtual HTMLElement* placeholderElement() const;
     virtual void updatePlaceholderText();
@@ skipping 59 matching lines @@
 
 inline HTMLTextAreaElement* toHTMLTextAreaElement(Node* node)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!node || isHTMLTextAreaElement(node));
     return static_cast<HTMLTextAreaElement*>(node);
 }
 
 } //namespace
 
 #endif