Fix under-invalidation of multicol with rule

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

Index: third_party/WebKit/Source/core/paint/BoxPaintInvalidator.cpp
diff --git a/third_party/WebKit/Source/core/paint/BoxPaintInvalidator.cpp b/third_party/WebKit/Source/core/paint/BoxPaintInvalidator.cpp
index 389dbf5879e343401e9a210e4f3cd0d2a38aa162..c4b483124e4a67f3843172c4577e92e6c2ef5d60 100644
--- a/third_party/WebKit/Source/core/paint/BoxPaintInvalidator.cpp
+++ b/third_party/WebKit/Source/core/paint/BoxPaintInvalidator.cpp
@@ -162,6 +162,10 @@ PaintInvalidationReason BoxPaintInvalidator::computePaintInvalidationReason() {
   if (m_box.isFrameSet())
     return PaintInvalidationBorderBoxChange;
 
+  // Needs to repaint column rules.
+  if (m_box.isLayoutMultiColumnSet())
+    return PaintInvalidationBorderBoxChange;
+
   return PaintInvalidationIncremental;
 }