Use float for scroll offset.

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

 /*
  * Copyright (C) 2005, 2006, 2008, 2011 Apple Inc. 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 67 matching lines @@
 void HistoryItem::setReferrer(const Referrer& referrer) {
   // This should be a RELEASE_ASSERT.
   m_referrer = SecurityPolicy::generateReferrer(referrer.referrerPolicy, url(),
                                                 referrer.referrer);
 }
 
 void HistoryItem::setTarget(const String& target) {
   m_target = target;
 }
 
-const FloatPoint& HistoryItem::visualViewportScrollPoint() const {
-  return m_visualViewportScrollPoint;
+const ScrollOffset& HistoryItem::visualViewportScrollOffset() const {
+  return m_visualViewportScrollOffset;
 }
 
-void HistoryItem::setVisualViewportScrollPoint(const FloatPoint& point) {
-  m_visualViewportScrollPoint = point;
+void HistoryItem::setVisualViewportScrollOffset(const ScrollOffset& offset) {
+  m_visualViewportScrollOffset = offset;
 }
 
-const IntPoint& HistoryItem::scrollPoint() const {
-  return m_scrollPoint;
+const ScrollOffset& HistoryItem::scrollOffset() const {
+  return m_scrollOffset;
 }
 
-void HistoryItem::setScrollPoint(const IntPoint& point) {
-  m_scrollPoint = point;
+void HistoryItem::setScrollOffset(const ScrollOffset& offset) {
+  m_scrollOffset = offset;
 }
 
 float HistoryItem::pageScaleFactor() const {
   return m_pageScaleFactor;
 }
 
 void HistoryItem::setPageScaleFactor(float scaleFactor) {
   m_pageScaleFactor = scaleFactor;
 }
 
@@ skipping 56 matching lines @@
 bool HistoryItem::isCurrentDocument(Document* doc) const {
   // FIXME: We should find a better way to check if this is the current document.
   return equalIgnoringFragmentIdentifier(url(), doc->url());
 }
 
 DEFINE_TRACE(HistoryItem) {
   visitor->trace(m_documentState);
 }
 
 }  // namespace blink