Optimize collapsed border calculation (step 2)

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

Index: third_party/WebKit/Source/core/layout/LayoutTable.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutTable.h b/third_party/WebKit/Source/core/layout/LayoutTable.h
index a6ea41f20895f1e328198d7bcf213fbf4f82e08e..e6046ef0bb46403c63a817815f983a83ea8ec469 100644
--- a/third_party/WebKit/Source/core/layout/LayoutTable.h
+++ b/third_party/WebKit/Source/core/layout/LayoutTable.h
@@ -417,6 +417,13 @@ class CORE_EXPORT LayoutTable final : public LayoutBlock {
   }
   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(); }
 
@@ -535,6 +542,7 @@ class CORE_EXPORT LayoutTable final : public LayoutBlock {
 
   void DistributeExtraLogicalHeight(int extra_logical_height);
 
+  void InvalidateCollapsedBordersOfAffectedCells();
   void RecalcCollapsedBordersIfNeeded();
 
   // TODO(layout-dev): All mutables in this class are lazily updated by