LayoutObject::adjustStyleDifference doesn't check backgroundColor when repainting

Source/core/style/ComputedStyle.h

Index: Source/core/style/ComputedStyle.h
diff --git a/Source/core/style/ComputedStyle.h b/Source/core/style/ComputedStyle.h
index e8f1dd447b7c3da63b8cea7aa1f136bd3b89779c..d1df9b096d29e0ff801c9360ca7d53df5fe2995b 100644
--- a/Source/core/style/ComputedStyle.h
+++ b/Source/core/style/ComputedStyle.h
@@ -415,6 +415,8 @@ public:
 
     bool hasAppearance() const { return appearance() != NoControlPart; }
 
+    bool isBackgroundColorCurrentColor() const { return backgroundColor().isCurrentColor() || visitedLinkBackgroundColor().isCurrentColor(); }
+
     bool hasBackground() const
     {
         Color color = visitedDependentColor(CSSPropertyBackgroundColor);