Add isTabStop attribute to Element

Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 2232 matching lines @@
 bool Element::isKeyboardFocusable() const
 {
     return isFocusable() && tabIndex() >= 0;
 }
 
 bool Element::isMouseFocusable() const
 {
     return isFocusable();
 }
 
+bool Element::isTabStop() const
+{
+    // Any element which never supports focus will always return false.
+    return supportsFocus() && (hasRareData() ? elementRareData()->isTabStop() : true);
+}
+
+void Element::setIsTabStop(bool flag)
+{
+    ensureElementRareData().setIsTabStop(flag);
+}
+
 void Element::dispatchFocusEvent(Element* oldFocusedElement, WebFocusType type)
 {
     RefPtrWillBeRawPtr<FocusEvent> event = FocusEvent::create(EventTypeNames::focus, false, false, document().domWindow(), 0, oldFocusedElement);
     EventDispatcher::dispatchEvent(*this, FocusEventDispatchMediator::create(event.release()));
 }
 
 void Element::dispatchBlurEvent(Element* newFocusedElement)
 {
     RefPtrWillBeRawPtr<FocusEvent> event = FocusEvent::create(EventTypeNames::blur, false, false, document().domWindow(), 0, newFocusedElement);
     EventDispatcher::dispatchEvent(*this, BlurEventDispatchMediator::create(event.release()));
@@ skipping 1107 matching lines @@
 {
 #if ENABLE(OILPAN)
     if (hasRareData())
         visitor->trace(elementRareData());
     visitor->trace(m_elementData);
 #endif
     ContainerNode::trace(visitor);
 }
 
 } // namespace blink