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 1312 matching lines @@
         void setPreviousPaintOffset(const LayoutPoint& paintOffset) { m_layoutObject.setPreviousPaintOffset(paintOffset); }
 
     private:
         friend class LayoutObject;
         MutableForPainting(const LayoutObject& layoutObject) : m_layoutObject(const_cast<LayoutObject&>(layoutObject)) { }
 
         LayoutObject& m_layoutObject;
     };
     MutableForPainting mutableForPainting() const { return MutableForPainting(*this); }
 
+    void setIsScrollAnchorObject() { m_bitfields.setIsScrollAnchorObject(true); }
+    // Clears the IsScrollAnchorObject bit, unless any ScrollAnchor still refers to us.
+    void maybeClearIsScrollAnchorObject();
+
 protected:
     enum LayoutObjectType {
         LayoutObjectBr,
         LayoutObjectCanvas,
         LayoutObjectFieldset,
         LayoutObjectCounter,
         LayoutObjectDetailsMarker,
         LayoutObjectEmbeddedObject,
         LayoutObjectFileUploadControl,
         LayoutObjectFrame,
@@ skipping 324 matching lines @@
             , m_hasPendingResourceUpdate(false)
             , m_isInsideFlowThread(false)
             , m_subtreeChangeListenerRegistered(false)
             , m_notifiedOfSubtreeChange(false)
             , m_consumesSubtreeChangeNotification(false)
             , m_childrenInline(false)
             , m_containsInlineWithOutlineAndContinuation(false)
             , m_alwaysCreateLineBoxesForLayoutInline(false)
             , m_lastBoxDecorationBackgroundObscured(false)
             , m_isBackgroundAttachmentFixedObject(false)
+            , m_isScrollAnchorObject(false)
             , m_positionedState(IsStaticallyPositioned)
             , m_selectionState(SelectionNone)
             , m_boxDecorationBackgroundState(NoBoxDecorationBackground)
             , m_fullPaintInvalidationReason(PaintInvalidationNone)
         {
         }
 
         // 32 bits have been used in the first word, and 17 in the second.
 
         // Self needs layout means that this layout object is marked for a full layout.
@@ skipping 116 matching lines @@
         // from LayoutBlockFlow
         ADD_BOOLEAN_BITFIELD(containsInlineWithOutlineAndContinuation, ContainsInlineWithOutlineAndContinuation);
 
         // from LayoutInline
         ADD_BOOLEAN_BITFIELD(alwaysCreateLineBoxesForLayoutInline, AlwaysCreateLineBoxesForLayoutInline);
 
         // For slimming-paint.
         ADD_BOOLEAN_BITFIELD(lastBoxDecorationBackgroundObscured, LastBoxDecorationBackgroundObscured);
 
         ADD_BOOLEAN_BITFIELD(isBackgroundAttachmentFixedObject, IsBackgroundAttachmentFixedObject);
+        ADD_BOOLEAN_BITFIELD(isScrollAnchorObject, IsScrollAnchorObject);
 
     private:
         // This is the cached 'position' value of this object
         // (see ComputedStyle::position).
         unsigned m_positionedState : 2; // PositionedState
         unsigned m_selectionState : 3; // SelectionState
         // Mutable for getter which lazily update this field.
         mutable unsigned m_boxDecorationBackgroundState : 2; // BoxDecorationBackgroundState
         unsigned m_fullPaintInvalidationReason : 5; // PaintInvalidationReason
 
@@ skipping 280 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