Use ScrollAnchor in FrameView and PaintLayerScrollableArea.

third_party/WebKit/Source/core/layout/LayoutObject.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google 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 1497 matching lines @@
     void setShouldInvalidateOverflowForPaint() { m_bitfields.setShouldInvalidateOverflowForPaint(true); }
     void setEverHadLayout() { m_bitfields.setEverHadLayout(true); }
 
     // Remove this object and all descendants from the containing LayoutFlowThread.
     void removeFromLayoutFlowThread();
 
     bool containsInlineWithOutlineAndContinuation() const { return m_bitfields.containsInlineWithOutlineAndContinuation(); }
     void setContainsInlineWithOutlineAndContinuation(bool b) { m_bitfields.setContainsInlineWithOutlineAndContinuation(b); }
 
     const LayoutRect& previousPaintInvalidationRect() const { return m_previousPaintInvalidationRect; }
+    bool scrollAnchoringEnabled() const;
 
 private:
     // This function generates a full invalidation, which
     // means invalidating both |oldBounds| and |newBounds|.
     //
     // This is the default choice when generating an invalidation,
     // as it is always correct, albeit it may force some extra painting.
     void fullyInvalidatePaint(const LayoutBoxModelObject& paintInvalidationContainer, PaintInvalidationReason, const LayoutRect& oldBounds, const LayoutRect& newBounds);
 
     // Adjusts a paint invalidation rect in the space of |m_previousPaintInvalidationRect| and |m_previousPositionFromPaintInvalidationBacking|
@@ skipping 51 matching lines @@
 #endif
 
     bool isTextOrSVGChild() const { return isText() || (isSVG() && !isSVGRoot()); }
 
     static bool isAllowedToModifyLayoutTreeStructure(Document&);
 
     // The passed rect is mutated into the coordinate space of the paint invalidation container.
     const LayoutBoxModelObject* invalidatePaintRectangleInternal(const LayoutRect&) const;
 
     static LayoutPoint uninitializedPaintOffset() { return LayoutPoint(LayoutUnit::max(), LayoutUnit::max()); }
+    void clearScrollAnchorIfNeeded() const;
 
     RefPtr<ComputedStyle> m_style;
 
     // Oilpan: raw pointer back to the owning Node is considered safe.
     GC_PLUGIN_IGNORE("http://crbug.com/509911")
     Node* m_node;
 
     LayoutObject* m_parent;
     LayoutObject* m_previous;
     LayoutObject* m_next;
@@ skipping 506 matching lines @@
 void showTree(const blink::LayoutObject*);
 void showLineTree(const blink::LayoutObject*);
 void showLayoutTree(const blink::LayoutObject* object1);
 // We don't make object2 an optional parameter so that showLayoutTree
 // can be called from gdb easily.
 void showLayoutTree(const blink::LayoutObject* object1, const blink::LayoutObject* object2);
 
 #endif
 
 #endif // LayoutObject_h