Compute snap offsets (both repeat and element based)

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 621 matching lines @@
     void formatForDebugger(char* buffer, unsigned length) const override;
 #endif
 
     bool pseudoStyleCacheIsInvalid(const ComputedStyle* currentStyle, ComputedStyle* newStyle);
 
     void cancelFocusAppearanceUpdate();
 
     const ComputedStyle* virtualEnsureComputedStyle(PseudoId pseudoElementSpecifier = NOPSEUDO) override { return ensureComputedStyle(pseudoElementSpecifier); }
 
     inline void updateCallbackSelectors(const ComputedStyle* oldStyle, const ComputedStyle* newStyle);
-    inline void removeCallbackSelectors();
-    inline void addCallbackSelectors();
+    inline void removeCallbackSelectors(const ComputedStyle*);
+    inline void addCallbackSelectors(const ComputedStyle*);
+
+    inline void updateScrollSnapMapping(const ComputedStyle* oldStyle, const ComputedStyle* newStyle);
+    inline void removeScrollSnapMapping(const ComputedStyle*);
+    inline void addScrollSnapMapping(const ComputedStyle*);
 
     // cloneNode is private so that non-virtual cloneElementWithChildren and cloneElementWithoutChildren
     // are used instead.
     PassRefPtrWillBeRawPtr<Node> cloneNode(bool deep) override;
     virtual PassRefPtrWillBeRawPtr<Element> cloneElementWithoutAttributesAndChildren();
 
     QualifiedName m_tagName;
 
     void updateNamedItemRegistration(const AtomicString& oldName, const AtomicString& newName);
     void updateExtraNamedItemRegistration(const AtomicString& oldName, const AtomicString& newName);
@@ skipping 249 matching lines @@
     static PassRefPtrWillBeRawPtr<T> create(const QualifiedName&, Document&)
 #define DEFINE_ELEMENT_FACTORY_WITH_TAGNAME(T) \
     PassRefPtrWillBeRawPtr<T> T::create(const QualifiedName& tagName, Document& document) \
     { \
         return adoptRefWillBeNoop(new T(tagName, document)); \
     }
 
 } // namespace
 
 #endif // Element_h