New interface and function for form association

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2006, 2007, 2008, 2009 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef HTMLObjectElement_h
 #define HTMLObjectElement_h
 
 #include "core/CoreExport.h"
+#include "core/html/FormAssociated.h"
 #include "core/html/HTMLPlugInElement.h"
 #include "core/html/ListedElement.h"
 
 namespace blink {
 
 class HTMLFormElement;
 
 // Inheritance of ListedElement was used for NPAPI form association, but
 // is still kept here so that legacy APIs such as form attribute can keep
 // working according to the spec.  See:
 // https://html.spec.whatwg.org/multipage/embedded-content.html#the-object-element
 class CORE_EXPORT HTMLObjectElement final : public HTMLPlugInElement,
-                                            public ListedElement {
+                                            public ListedElement,
+                                            public FormAssociated {
   DEFINE_WRAPPERTYPEINFO();
   USING_GARBAGE_COLLECTED_MIXIN(HTMLObjectElement);
 
  public:
   static HTMLObjectElement* create(Document&,
                                    HTMLFormElement*,
                                    bool createdByParser);
   ~HTMLObjectElement() override;
   DECLARE_VIRTUAL_TRACE();
 
@@ skipping 19 matching lines @@
   bool checkValidity() { return true; }
   bool reportValidity() { return true; }
   void setCustomValidity(const String&) override {}
 
   bool canContainRangeEndPoint() const override { return useFallbackContent(); }
 
   bool isExposed() const;
 
   bool willUseFallbackContentAtLayout() const;
 
+  FormAssociated* toFormAssociatedOrNull() override { return this; };
+  void associateWith(HTMLFormElement*) override;
+
  private:
   HTMLObjectElement(Document&, HTMLFormElement*, bool createdByParser);
 
   void parseAttribute(const QualifiedName&,
                       const AtomicString&,
                       const AtomicString&) override;
   bool isPresentationAttribute(const QualifiedName&) const override;
   void collectStyleForPresentationAttribute(const QualifiedName&,
                                             const AtomicString&,
                                             MutableStylePropertySet*) override;
@@ skipping 65 matching lines @@
       static_cast<const HTMLObjectElement&>(element);
   // We need to assert after the cast because ListedElement doesn't
   // have hasTagName.
   SECURITY_DCHECK(objectElement.hasTagName(HTMLNames::objectTag));
   return objectElement;
 }
 
 }  // namespace blink
 
 #endif  // HTMLObjectElement_h