Added pinch viewport offset to history item.

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 86 matching lines @@
 void HistoryItem::setReferrer(const Referrer& referrer)
 {
     m_referrer = referrer;
 }
 
 void HistoryItem::setTarget(const String& target)
 {
     m_target = target;
 }
 
+const FloatPoint& HistoryItem::pinchViewportScrollPoint() const
+{
+    return m_pinchViewportScrollPoint;
+}
+
+void HistoryItem::setPinchViewportScrollPoint(const FloatPoint& point)
+{
+    m_pinchViewportScrollPoint = point;
+}
+
 const IntPoint& HistoryItem::scrollPoint() const
 {
     return m_scrollPoint;
 }
 
 void HistoryItem::setScrollPoint(const IntPoint& point)
 {
     m_scrollPoint = point;
 }
 
 void HistoryItem::clearScrollPoint()
 {
-    m_scrollPoint.setX(0);
-    m_scrollPoint.setY(0);
+    m_scrollPoint = IntPoint();
+    m_pinchViewportScrollPoint = FloatPoint();
 }
 
 float HistoryItem::pageScaleFactor() const
 {
     return m_pageScaleFactor;
 }
 
 void HistoryItem::setPageScaleFactor(float scaleFactor)
 {
     m_pageScaleFactor = scaleFactor;
@@ skipping 67 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());
 }
 
 } // namespace WebCore