New interface and function for form association

third_party/WebKit/Source/core/html/HTMLElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004-2007, 2009, 2014 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 11 matching lines @@
 
 #ifndef HTMLElement_h
 #define HTMLElement_h
 
 #include "core/CoreExport.h"
 #include "core/dom/Element.h"
 
 namespace blink {
 
 class DocumentFragment;
+class ExceptionState;
+class FormAssociated;
 class HTMLFormElement;
 class HTMLMenuElement;
-class ExceptionState;
 class KeyboardEvent;
 
 enum TranslateAttributeMode {
   TranslateAttributeYes,
   TranslateAttributeNo,
   TranslateAttributeInherit
 };
 
 class CORE_EXPORT HTMLElement : public Element {
   DEFINE_WRAPPERTYPEINFO();
@@ skipping 67 matching lines @@
 
   virtual String altText() const { return String(); }
 
   int offsetLeftForBinding();
   int offsetTopForBinding();
   int offsetWidthForBinding();
   int offsetHeightForBinding();
 
   Element* unclosedOffsetParent();
 
+  virtual FormAssociated* toFormAssociatedOrNull() { return nullptr; };
+
  protected:
   HTMLElement(const QualifiedName& tagName, Document&, ConstructionType);
 
   enum AllowPercentage { DontAllowPercentageValues, AllowPercentageValues };
   void addHTMLLengthToStyle(MutableStylePropertySet*,
                             CSSPropertyID,
                             const String& value,
                             AllowPercentage = AllowPercentageValues);
   void addHTMLColorToStyle(MutableStylePropertySet*,
                            CSSPropertyID,
@@ skipping 101 matching lines @@
   inline bool isElementOfType<const thisType>(const HTMLElement& element) {  \
     return is##thisType(element);                                            \
   }                                                                          \
   DEFINE_ELEMENT_TYPE_CASTS_WITH_FUNCTION(thisType)
 
 }  // namespace blink
 
 #include "core/HTMLElementTypeHelpers.h"
 
 #endif  // HTMLElement_h