Reland of Paint collapsed borders of a table as one display item

third_party/WebKit/Source/core/paint/PaintInvalidator.cpp

Index: third_party/WebKit/Source/core/paint/PaintInvalidator.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintInvalidator.cpp b/third_party/WebKit/Source/core/paint/PaintInvalidator.cpp
index 9982e8a03fa82f724ad7bf3b25c33e0bfe9c0ef2..8756306ee433056fc3d6e475a40672de6e7f1741 100644
--- a/third_party/WebKit/Source/core/paint/PaintInvalidator.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintInvalidator.cpp
@@ -214,11 +214,8 @@
     context.paintingLayer->setNeedsPaintPhaseDescendantBlockBackgrounds();
   }
 
-  if (object.isTable()) {
-    const LayoutTable& table = toLayoutTable(object);
-    if (table.collapseBorders() && !table.collapsedBorders().isEmpty())
-      context.paintingLayer->setNeedsPaintPhaseDescendantBlockBackgrounds();
-  }
+  if (object.isTable() && toLayoutTable(object).hasCollapsedBorders())
+    context.paintingLayer->setNeedsPaintPhaseDescendantBlockBackgrounds();
 }
 
 namespace {