Use viewportConstrainedVisibleContentRect() to get the scrolling offset

Source/core/frame/FrameView.h

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 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
@@ skipping 289 matching lines @@
     // This function exists for ports that need to handle wheel events manually.
     // On Mac WebKit1 the underlying NSScrollView just does the scrolling, but on most other platforms
     // we need this function in order to do the scroll ourselves.
     bool wheelEvent(const PlatformWheelEvent&);
 
     bool inProgrammaticScroll() const { return m_inProgrammaticScroll; }
     void setInProgrammaticScroll(bool programmaticScroll) { m_inProgrammaticScroll = programmaticScroll; }
 
     virtual bool isActive() const override;
 
     // DEPRECATED: Use viewportConstrainedVisibleContentRect() instead.

[Xianzhu, 2014/12/11 19:59:26]

Please remove this line.

-    IntSize scrollOffsetForFixedPosition() const;
+    IntSize scrollOffsetForViewportConstrainedObjects() const;
 
     // Override scrollbar notifications to update the AXObject cache.
     virtual void didAddScrollbar(Scrollbar*, ScrollbarOrientation) override;
     virtual void willRemoveScrollbar(Scrollbar*, ScrollbarOrientation) override;
 
     // FIXME: This should probably be renamed as the 'inSubtreeLayout' parameter
     // passed around the FrameView layout methods can be true while this returns
     // false.
     bool isSubtreeLayout() const { return !!m_layoutSubtreeRoot; }
 
@@ skipping 523 matching lines @@
     }
 
 private:
     RawPtrWillBeMember<FrameView> m_view;
     bool m_originalValue;
 };
 
 } // namespace blink
 
 #endif // FrameView_h