(WIP) Paint invalidation for slimming paint v2

Source/core/layout/LayoutTable.cpp

Index: Source/core/layout/LayoutTable.cpp
diff --git a/Source/core/layout/LayoutTable.cpp b/Source/core/layout/LayoutTable.cpp
index da3ff14dfada3c142f76b33514eda5183e582e57..c648b09746806a2c80cbcf973cd1b394cd9715f6 100644
--- a/Source/core/layout/LayoutTable.cpp
+++ b/Source/core/layout/LayoutTable.cpp
@@ -1397,6 +1397,14 @@ PaintInvalidationReason LayoutTable::invalidatePaintIfNeeded(PaintInvalidationSt
     return LayoutBlock::invalidatePaintIfNeeded(paintInvalidationState, paintInvalidationContainer);
 }
 
+PaintInvalidationReason LayoutTable::invalidatePaintIfNeededForSlimmingPaintV2(const LayoutPoint& newPaintOffset)
+{
+    // Information of collapsed borders doesn't affect layout and are for painting only.
+    // Do it now instead of during painting to invalidate table cells if needed.
+    recalcCollapsedBordersIfNeeded();
+    return LayoutBlock::invalidatePaintIfNeededForSlimmingPaintV2(newPaintOffset);
+}
+
 void LayoutTable::invalidatePaintOfSubtreesIfNeeded(PaintInvalidationState& childPaintInvalidationState)
 {
     if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {