Paint backgrounds of a table section/row in one display item

third_party/WebKit/Source/core/layout/LayoutTableSection.cpp

Index: third_party/WebKit/Source/core/layout/LayoutTableSection.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutTableSection.cpp b/third_party/WebKit/Source/core/layout/LayoutTableSection.cpp
index 2bde0f0ab436ca7d0be1c675afd42fcd2e7431d8..eb568c4f6d569031db814f4c7ede362d4055cb57 100644
--- a/third_party/WebKit/Source/core/layout/LayoutTableSection.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutTableSection.cpp
@@ -1280,13 +1280,10 @@ void LayoutTableSection::computeOverflowFromCells(unsigned totalRows,
   for (unsigned r = 0; r < totalRows; r++) {
     unsigned nCols = numCols(r);
     for (unsigned c = 0; c < nCols; c++) {
-      CellStruct& cs = cellAt(r, c);
-      LayoutTableCell* cell = cs.primaryCell();
-      if (!cell || cs.inColSpan)
-        continue;
-      if (r < totalRows - 1 && cell == primaryCellAt(r + 1, c))
+      const auto* cell = originatingCellAt(r, c);
+      if (!cell)
         continue;
-      addOverflowFromChild(cell);
+      addOverflowFromChild(*cell);
 #if DCHECK_IS_ON()
       hasOverflowingCell |= cell->hasVisualOverflow();
 #endif
@@ -1530,7 +1527,7 @@ LayoutRect LayoutTableSection::logicalRectForWritingModeAndDirection(
 
 CellSpan LayoutTableSection::dirtiedRows(const LayoutRect& damageRect) const {
   if (m_forceSlowPaintPathWithOverflowingCell)
-    return fullTableRowSpan();
+    return fullSectionRowSpan();
 
   if (!m_grid.size())
     return CellSpan(0, 0);
@@ -2138,4 +2135,13 @@ bool LayoutTableSection::mapToVisualRectInAncestorSpaceInternal(
       ancestor, transformState, flags);
 }
 
+bool LayoutTableSection::paintedOutputOfObjectHasNoEffectRegardlessOfSize()
+    const {
+  // LayoutTableSection paints background from columns.
+  if (table()->hasColElements())
+    return false;
+  return LayoutTableBoxComponent::
+      paintedOutputOfObjectHasNoEffectRegardlessOfSize();
+}
+
 }  // namespace blink