Set needsPaintPhaseDescendantBlockBackgrounds if a table has collapsed borders

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

Index: third_party/WebKit/Source/core/layout/LayoutTable.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutTable.cpp b/third_party/WebKit/Source/core/layout/LayoutTable.cpp
index bbcf8f535af38fc826047c784e00c1691ea15bf9..6d8013aee8026b4186db6ecfbcc73ec4bf9740b6 100644
--- a/third_party/WebKit/Source/core/layout/LayoutTable.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutTable.cpp
@@ -1401,6 +1401,9 @@ PaintInvalidationReason LayoutTable::invalidatePaintIfNeeded(const PaintInvalida
     // 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();
+    if (collapseBorders() && !m_collapsedBorders.isEmpty())
+        paintInvalidationState.enclosingSelfPaintingLayer(*this).setNeedsPaintPhaseDescendantBlockBackgrounds();
+
     return LayoutBlock::invalidatePaintIfNeeded(paintInvalidationState);
 }