Make it possibe to lock the fixedLayoutSize

Source/core/platform/ScrollView.h

 /*
  * Copyright (C) 2004, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Holger Hans Peter Freyther
  *
  * 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 120 matching lines @@
 
     // Functions for getting/setting the size webkit should use to layout the contents. By default this is the same as the visible
     // content size. Explicitly setting a layout size value will cause webkit to layout the contents using this size instead.
     IntSize layoutSize(VisibleContentRectIncludesScrollbars = ExcludeScrollbars) const;
     int layoutWidth(VisibleContentRectIncludesScrollbars scrollbarInclusion = ExcludeScrollbars) const { return layoutSize(scrollbarInclusion).width(); }
     int layoutHeight(VisibleContentRectIncludesScrollbars scrollbarInclusion = ExcludeScrollbars) const { return layoutSize(scrollbarInclusion).height(); }
     IntSize fixedLayoutSize() const;
     void setFixedLayoutSize(const IntSize&);
     bool useFixedLayout() const;
     void setUseFixedLayout(bool enable);
+    void setFixedLayoutSizeLock(bool);
+    bool fixedLayoutSizeLock() const;
 
     // Functions for getting/setting the size of the document contained inside the ScrollView (as an IntSize or as individual width and height
     // values).
     virtual IntSize contentsSize() const OVERRIDE; // Always at least as big as the visibleWidth()/visibleHeight().
     int contentsWidth() const { return contentsSize().width(); }
     int contentsHeight() const { return contentsSize().height(); }
     virtual void setContentsSize(const IntSize&);
 
     // Functions for querying the current scrolled position (both as a point, a size, or as individual X and Y values).
     virtual IntPoint scrollPosition() const OVERRIDE { return visibleContentRect().location(); }
@@ skipping 167 matching lines @@
 
     int m_scrollbarsAvoidingResizer;
     bool m_scrollbarsSuppressed;
 
     bool m_inUpdateScrollbars;
     unsigned m_updateScrollbarsPass;
 
     IntPoint m_panScrollIconPoint;
     bool m_drawPanScrollIcon;
     bool m_useFixedLayout;
+    bool m_fixedLayoutSizeLock;
 
     bool m_paintsEntireContents;
     bool m_clipsRepaints;
 
     void init();
     void destroy();
 
     IntRect rectToCopyOnScroll() const;
 
     // Called when the scroll position within this view changes.  FrameView overrides this to generate repaint invalidations.
@@ skipping 17 matching lines @@
     ASSERT(!widget || widget->isScrollView());
     return static_cast<const ScrollView*>(widget);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toScrollView(const ScrollView*);
 
 } // namespace WebCore
 
 #endif // ScrollView_h