Clean compositing inputs for location APIs for sticky-affected elements.

third_party/WebKit/Source/core/dom/Element.h

 /*
  * 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)
  * Copyright (C) 2003-2011, 2013, 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
@@ skipping 829 matching lines @@
   void ClassAttributeChanged(const AtomicString& new_class_string);
 
   static bool AttributeValueIsJavaScriptURL(const Attribute&);
 
   PassRefPtr<ComputedStyle> OriginalStyleForLayoutObject();
 
   Node* InsertAdjacent(const String& where, Node* new_child, ExceptionState&);
 
   virtual void ParserDidSetAttributes() {}
 
+  // Helper method which ensures that the lifecycle is valid to calculate
+  // location based APIs such as offsetTop.
+  void EnsureLifecycleValidForLocationAPIs();
+
  private:
   void ScrollLayoutBoxBy(const ScrollToOptions&);
   void ScrollLayoutBoxTo(const ScrollToOptions&);
   void ScrollFrameBy(const ScrollToOptions&);
   void ScrollFrameTo(const ScrollToOptions&);
 
   bool HasElementFlag(ElementFlags mask) const {
     return HasRareData() && HasElementFlagInternal(mask);
   }
   void SetElementFlag(ElementFlags, bool value = true);
@@ skipping 373 matching lines @@
 #define DECLARE_ELEMENT_FACTORY_WITH_TAGNAME(T) \
   static T* Create(const QualifiedName&, Document&)
 #define DEFINE_ELEMENT_FACTORY_WITH_TAGNAME(T)                     \
   T* T::Create(const QualifiedName& tagName, Document& document) { \
     return new T(tagName, document);                               \
   }
 
 }  // namespace blink
 
 #endif  // Element_h