Use float for scroll offset.

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 20 matching lines @@
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/CSSSelector.h"
 #include "core/dom/AXObjectCache.h"
 #include "core/dom/Attribute.h"
 #include "core/dom/ContainerNode.h"
 #include "core/dom/Document.h"
 #include "core/dom/ElementData.h"
 #include "core/dom/SpaceSplitString.h"
 #include "core/html/CollectionType.h"
 #include "platform/heap/Handle.h"
+#include "platform/scroll/ScrollTypes.h"
 #include "public/platform/WebFocusType.h"
 
 namespace blink {
 
 class ElementAnimations;
 class Attr;
 class Attribute;
 class CSSStyleDeclaration;
 class ClientRect;
 class ClientRectList;
@@ skipping 596 matching lines @@
 
   bool isSpellCheckingEnabled() const;
 
   // FIXME: public for LayoutTreeBuilder, we shouldn't expose this though.
   PassRefPtr<ComputedStyle> styleForLayoutObject();
 
   bool hasID() const;
   bool hasClass() const;
   const SpaceSplitString& classNames() const;
 
-  IntSize savedLayerScrollOffset() const;
-  void setSavedLayerScrollOffset(const IntSize&);
+  ScrollOffset savedLayerScrollOffset() const;
+  void setSavedLayerScrollOffset(const ScrollOffset&);
 
   ElementAnimations* elementAnimations() const;
   ElementAnimations& ensureElementAnimations();
   bool hasAnimations() const;
 
   void synchronizeAttribute(const AtomicString& localName) const;
 
   MutableStylePropertySet& ensureMutableInlineStyle();
   void clearMutableInlineStyleIfEmpty();
 
@@ skipping 473 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