Get rid of a lot of special code for RenderFlowThread invalidation.

Source/core/rendering/RenderFlowThread.h

 /*
  * Copyright (C) 2011 Adobe Systems Incorporated. All rights reserved.
  *
  * 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.
@@ skipping 43 matching lines @@
 
 class RenderFlowThread: public RenderBlockFlow {
 public:
     RenderFlowThread();
     virtual ~RenderFlowThread() { };
 
     virtual bool isRenderFlowThread() const override final { return true; }
     virtual bool isRenderMultiColumnFlowThread() const { return false; }
     virtual bool isRenderPagedFlowThread() const { return false; }
 
+    virtual bool supportsPaintInvalidationStateCachedOffsets() const override { return false; }
+
     virtual void layout() override;
 
     // Always create a RenderLayer for the RenderFlowThread so that we
     // can easily avoid drawing the children directly.
     virtual LayerType layerTypeRequired() const override final { return NormalLayer; }
 
     virtual void flowThreadDescendantWasInserted(RenderObject*) { }
 
     virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) override final;
 
     virtual void addRegionToThread(RenderMultiColumnSet*) = 0;
     virtual void removeRegionFromThread(RenderMultiColumnSet*);
 
     virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const override;
 
     bool hasRegions() const { return m_multiColumnSetList.size(); }
 
     void validateRegions();
     void invalidateRegions();
     bool hasValidRegionInfo() const { return !m_regionsInvalidated && !m_multiColumnSetList.isEmpty(); }
 
-    void paintInvalidationRectangleInRegions(const LayoutRect&) const;
+    virtual void mapRectToPaintInvalidationBacking(const RenderLayerModelObject* paintInvalidationContainer, LayoutRect&, const PaintInvalidationState*) const override;
 
     LayoutUnit pageLogicalHeightForOffset(LayoutUnit);
     LayoutUnit pageRemainingLogicalHeightForOffset(LayoutUnit, PageBoundaryRule = IncludePageBoundary);
 
     virtual void setPageBreak(LayoutUnit /*offset*/, LayoutUnit /*spaceShortage*/) { }
     virtual void updateMinimumPageHeight(LayoutUnit /*offset*/, LayoutUnit /*minHeight*/) { }
 
     bool regionsHaveUniformLogicalHeight() const { return m_regionsHaveUniformLogicalHeight; }
 
     // FIXME: These 2 functions should return a RenderMultiColumnSet.
     RenderRegion* firstRegion() const;
     RenderRegion* lastRegion() const;
 
     virtual bool addForcedRegionBreak(LayoutUnit, RenderObject* breakChild, bool isBefore, LayoutUnit* offsetBreakAdjustment = 0) { return false; }
 
     virtual bool isPageLogicalHeightKnown() const { return true; }
     bool pageLogicalSizeChanged() const { return m_pageLogicalSizeChanged; }
 
     void collectLayerFragments(LayerFragments&, const LayoutRect& layerBoundingBox, const LayoutRect& dirtyRect);
-    LayoutRect fragmentsBoundingBox(const LayoutRect& layerBoundingBox);
+    LayoutRect fragmentsBoundingBox(const LayoutRect& layerBoundingBox) const;
 
     LayoutPoint flowThreadPointToVisualPoint(const LayoutPoint& flowThreadPoint) const
     {
         return flowThreadPoint + columnOffset(flowThreadPoint);
     }
 
     void pushFlowThreadLayoutState(const RenderObject&);
     void popFlowThreadLayoutState();
     LayoutUnit offsetFromLogicalTopOfFirstRegion(const RenderBlock*) const;
 
     // Used to estimate the maximum height of the flow thread.
     static LayoutUnit maxLogicalHeight() { return LayoutUnit::max() / 2; }
 
 protected:
     virtual const char* renderName() const = 0;
 
     void updateRegionsFlowThreadPortionRect();
-    bool shouldIssuePaintInvalidations(const LayoutRect&) const;
 
     virtual RenderMultiColumnSet* columnSetAtBlockOffset(LayoutUnit) const = 0;
 
     bool cachedOffsetFromLogicalTopOfFirstRegion(const RenderBox*, LayoutUnit&) const;
     void setOffsetFromLogicalTopOfFirstRegion(const RenderBox*, LayoutUnit);
     void clearOffsetFromLogicalTopOfFirstRegion(const RenderBox*);
 
     const RenderBox* currentStatePusherRenderBox() const;
 
     RenderMultiColumnSetList m_multiColumnSetList;
@@ skipping 53 matching lines @@
 };
 
 template <> struct ValueToString<RenderMultiColumnSet*> {
     static String string(const RenderMultiColumnSet* value) { return String::format("%p", value); }
 };
 #endif
 
 } // namespace blink
 
 #endif // RenderFlowThread_h