Optimize collapsed border calculation (step 2)

third_party/WebKit/Source/core/layout/LayoutTable.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, 2009, 2010 Apple Inc.
  *               All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 399 matching lines @@
   LayoutTableCell* CellBefore(const LayoutTableCell*) const;
   LayoutTableCell* CellAfter(const LayoutTableCell*) const;
 
   using CollapsedBorderValues = Vector<CollapsedBorderValue>;
   const CollapsedBorderValues& CollapsedBorders() const {
     DCHECK(collapsed_borders_valid_);
     return collapsed_borders_;
   }
   void InvalidateCollapsedBorders();
   void InvalidateCollapsedBordersForAllCellsIfNeeded();
+  bool NeedsInvalidateCollapsedBordersForAllCells() const {
+    return needs_invalidate_collapsed_borders_for_all_cells_;
+  }
+  void SetNeedsInvalidateCollapsedBordersForAllCells() {
+    InvalidateCollapsedBorders();
+    needs_invalidate_collapsed_borders_for_all_cells_ = true;
+  }
 
   bool HasSections() const { return Header() || Footer() || FirstBody(); }
 
   void RecalcSectionsIfNeeded() const {
     if (needs_section_recalc_)
       RecalcSections();
   }
 
   static LayoutTable* CreateAnonymousWithParent(const LayoutObject*);
   LayoutBox* CreateAnonymousBoxWithSameTypeAs(
@@ skipping 98 matching lines @@
                      SubtreeLayoutScope&,
                      LayoutUnit logical_left,
                      TableHeightChangingValue);
 
   // Return the logical height based on the height, min-height and max-height
   // properties from CSS. Will return 0 if auto.
   LayoutUnit LogicalHeightFromStyle() const;
 
   void DistributeExtraLogicalHeight(int extra_logical_height);
 
+  void InvalidateCollapsedBordersOfAffectedCells();
   void RecalcCollapsedBordersIfNeeded();
 
   // TODO(layout-dev): All mutables in this class are lazily updated by
   // recalcSections() which is called by various getter methods (e.g.
   // borderBefore(), borderAfter()).
   // They allow dirty layout even after DocumentLifecycle::LayoutClean which
   // seems not proper. crbug.com/538236.
 
   // Holds spans (number of absolute columns) of effective columns.
   // See "absolute column index vs effective column index" in comments of
@@ skipping 74 matching lines @@
   if (first_body_)
     return first_body_;
   return foot_;
 }
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutTable, IsTable());
 
 }  // namespace blink
 
 #endif  // LayoutTable_h