Incrementally invalidate boxes with borders if possible

Source/core/rendering/RenderBox.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2006, 2007 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 661 matching lines @@
     RenderObject* splitAnonymousBoxesAroundChild(RenderObject* beforeChild);
 
     virtual void addLayerHitTestRects(LayerHitTestRects&, const RenderLayer* currentCompositedLayer, const LayoutPoint& layerOffset, const LayoutRect& containerRect) const OVERRIDE;
     virtual void computeSelfHitTestRects(Vector<LayoutRect>&, const LayoutPoint& layerOffset) const OVERRIDE;
 
     void updateIntrinsicContentLogicalHeight(LayoutUnit intrinsicContentLogicalHeight) const { m_intrinsicContentLogicalHeight = intrinsicContentLogicalHeight; }
 
     virtual InvalidationReason getPaintInvalidationReason(const RenderLayerModelObject& paintInvalidationContainer,
         const LayoutRect& oldBounds, const LayoutPoint& oldPositionFromPaintInvalidationContainer,
         const LayoutRect& newBounds, const LayoutPoint& newPositionFromPaintInvalidationContainer) OVERRIDE;
+    virtual void incrementallyInvalidatePaint(const RenderLayerModelObject& paintInvalidationContainer, const LayoutRect& oldBounds, const LayoutRect& newBounds, const LayoutPoint& positionFromPaintInvalidationContainer) OVERRIDE;
 
     virtual void clearPaintInvalidationState(const PaintInvalidationState&) OVERRIDE;
 #if ENABLE(ASSERT)
     virtual bool paintInvalidationStateIsDirty() const OVERRIDE;
 #endif
 
 private:
     void updateShapeOutsideInfoAfterStyleChange(const RenderStyle&, const RenderStyle* oldStyle);
     void updateGridPositionAfterStyleChange(const RenderStyle*);
 
@@ skipping 32 matching lines @@
     virtual void computePreferredLogicalWidths() { clearPreferredLogicalWidthsDirty(); }
 
     RenderBoxRareData& ensureRareData()
     {
         if (!m_rareData)
             m_rareData = adoptPtr(new RenderBoxRareData());
         return *m_rareData.get();
     }
 
     void savePreviousBorderBoxSizeIfNeeded();
+    LayoutSize computePreviousBorderBoxSize(const LayoutSize& previousBoundsSize) const;
+
     bool logicalHeightComputesAsNone(SizeType) const;
 
     virtual InvalidationReason invalidatePaintIfNeeded(const PaintInvalidationState&, const RenderLayerModelObject& newPaintInvalidationContainer) OVERRIDE FINAL;
 
     bool isBox() const WTF_DELETED_FUNCTION; // This will catch anyone doing an unnecessary check.
 
     // The width/height of the contents + borders + padding.  The x/y location is relative to our container (which is not always our parent).
     LayoutRect m_frameRect;
 
     // Our intrinsic height, used for min-height: min-content etc. Maintained by
@@ skipping 55 matching lines @@
         if (UNLIKELY(inlineBoxWrapper() != 0))
             deleteLineBoxWrapper();
     }
 
     ensureRareData().m_inlineBoxWrapper = boxWrapper;
 }
 
 } // namespace blink
 
 #endif // RenderBox_h