Don't repaint when setting border or outline 0 with style none

Source/core/rendering/style/StyleBackgroundData.cpp

Index: Source/core/rendering/style/StyleBackgroundData.cpp
diff --git a/Source/core/rendering/style/StyleBackgroundData.cpp b/Source/core/rendering/style/StyleBackgroundData.cpp
index d0b7ba4ff27efb20c272a5dfe51177b7907cb6fb..1dcfc53fb58e766b1fdcb6d28584ab754bddeed2 100644
--- a/Source/core/rendering/style/StyleBackgroundData.cpp
+++ b/Source/core/rendering/style/StyleBackgroundData.cpp
@@ -46,4 +46,9 @@ bool StyleBackgroundData::operator==(const StyleBackgroundData& o) const
     return m_background == o.m_background && m_color == o.m_color && m_outline == o.m_outline;
 }
 
+bool StyleBackgroundData::visuallyEqual(const StyleBackgroundData& o) const
+{
+    return m_background == o.m_background && m_color == o.m_color && m_outline.visuallyEqual(o.m_outline);
+}
+
 } // namespace WebCore