Combine and simplify LayoutTableSection::DirtiedRows() and DirtiedEffectiveColumns()

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

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2009, 2013 Apple Inc.
  *               All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 329 matching lines @@
 
   LayoutRect DebugRect() const override;
 
   void AdjustChildDebugRect(LayoutRect&) const override;
 
   // A table cell's location is relative to its containing section.
   LayoutBox* LocationContainer() const override { return Section(); }
 
   bool HasLineIfEmpty() const override;
 
+  static bool CompareInDOMOrder(const LayoutTableCell* cell1,
+                                const LayoutTableCell* cell2) {
+    DCHECK(cell1->Section() == cell2->Section());
+    if (cell1->RowIndex() == cell2->RowIndex())
+      return cell1->absolute_column_index_ < cell2->absolute_column_index_;
+    return cell1->RowIndex() < cell2->RowIndex();
+  }
+
  protected:
   void StyleDidChange(StyleDifference, const ComputedStyle* old_style) override;
   void ComputePreferredLogicalWidths() override;
 
   void AddLayerHitTestRects(LayerHitTestRects&,
                             const PaintLayer* current_composited_layer,
                             const LayoutPoint& layer_offset,
                             const LayoutRect& container_rect) const override;
 
   PaintInvalidationReason InvalidatePaint(
@@ skipping 118 matching lines @@
   return ToLayoutTableCell(FirstChild());
 }
 
 inline LayoutTableCell* LayoutTableRow::LastCell() const {
   return ToLayoutTableCell(LastChild());
 }
 
 }  // namespace blink
 
 #endif  // LayoutTableCell_h