Use float for scroll offset.

third_party/WebKit/Source/core/loader/HistoryItem.h

 /*
  * Copyright (C) 2006, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Research In Motion Limited. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 15 matching lines @@
 
 #ifndef HistoryItem_h
 #define HistoryItem_h
 
 #include "bindings/core/v8/SerializedScriptValue.h"
 #include "core/CoreExport.h"
 #include "core/loader/FrameLoaderTypes.h"
 #include "platform/geometry/FloatPoint.h"
 #include "platform/geometry/IntPoint.h"
 #include "platform/heap/Handle.h"
+#include "platform/scroll/ScrollTypes.h"
 #include "platform/weborigin/Referrer.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class Document;
 class DocumentState;
 class EncodedFormData;
 class KURL;
 class ResourceRequest;
 
 class CORE_EXPORT HistoryItem final
     : public GarbageCollectedFinalized<HistoryItem> {
  public:
   static HistoryItem* create() { return new HistoryItem; }
   ~HistoryItem();
 
   const String& urlString() const;
   KURL url() const;
 
   const Referrer& referrer() const;
   const String& target() const;
 
   EncodedFormData* formData();
   const AtomicString& formContentType() const;
 
-  const FloatPoint& visualViewportScrollPoint() const;
-  void setVisualViewportScrollPoint(const FloatPoint&);
-  const IntPoint& scrollPoint() const;
-  void setScrollPoint(const IntPoint&);
+  const ScrollOffset& visualViewportScrollOffset() const;
+  void setVisualViewportScrollOffset(const ScrollOffset&);
+  const ScrollOffset& scrollOffset() const;
+  void setScrollOffset(const ScrollOffset&);
 
   float pageScaleFactor() const;
   void setPageScaleFactor(float);
 
   Vector<String> getReferencedFilePaths();
   const Vector<String>& documentState();
   void setDocumentState(const Vector<String>&);
   void setDocumentState(DocumentState*);
   void clearDocumentState();
 
@@ skipping 30 matching lines @@
 
   DECLARE_TRACE();
 
  private:
   HistoryItem();
 
   String m_urlString;
   Referrer m_referrer;
   String m_target;
 
-  FloatPoint m_visualViewportScrollPoint;
-  IntPoint m_scrollPoint;
+  ScrollOffset m_visualViewportScrollOffset;
+  ScrollOffset m_scrollOffset;
   float m_pageScaleFactor;
   Vector<String> m_documentStateVector;
   Member<DocumentState> m_documentState;
 
   // If two HistoryItems have the same item sequence number, then they are
   // clones of one another. Traversing history from one such HistoryItem to
   // another is a no-op. HistoryItem clones are created for parent and
   // sibling frames when only a subframe navigates.
   int64_t m_itemSequenceNumber;
 
@@ skipping 11 matching lines @@
 
   // info used to repost form data
   RefPtr<EncodedFormData> m_formData;
   AtomicString m_formContentType;
 
 };  // class HistoryItem
 
 }  // namespace blink
 
 #endif  // HISTORYITEM_H