Separate backgroundObscurationStatus and hasBoxDecorationBackground

third_party/WebKit/Source/core/style/ComputedStyle.h

Index: third_party/WebKit/Source/core/style/ComputedStyle.h
diff --git a/third_party/WebKit/Source/core/style/ComputedStyle.h b/third_party/WebKit/Source/core/style/ComputedStyle.h
index fee328e23171e67405ef60f6aeeb23f708d4012b..2a2912b0816b97946192ac85e064c806b67ddcfe 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyle.h
+++ b/third_party/WebKit/Source/core/style/ComputedStyle.h
@@ -2317,6 +2317,7 @@ public:
     // Border utility functions.
     bool borderObscuresBackground() const;
     void getBorderEdgeInfo(BorderEdge edges[], bool includeLogicalLeftEdge = true, bool includeLogicalRightEdge = true) const;
+
     bool hasBoxDecorations() const
     {
         return hasBorderDecoration()
@@ -2329,6 +2330,14 @@ public:
             || resize() != RESIZE_NONE;
     }
 
+    // "Box decoration background" includes all box decorations and backgrounds
+    // that are painted as the background of the object. It includes borders,
+    // box-shadows, background-color and background-image, etc.
+    bool hasBoxDecorationBackground() const
+    {
+        return hasBackground() || hasBorderDecoration() || hasAppearance() || boxShadow();
+    }
+
     // Background utility functions.
     FillLayer& accessBackgroundLayers() { return m_background.access()->m_background; }
     const FillLayer& backgroundLayers() const { return m_background->background(); }