Make compositingState explicit

Source/core/rendering/RenderView.cpp

Index: Source/core/rendering/RenderView.cpp
diff --git a/Source/core/rendering/RenderView.cpp b/Source/core/rendering/RenderView.cpp
index 474aff60ac86d42698d581938b1dadec7dea9da3..4669d8a60aa1d628ec51a50b9e4adb1dc9a025c0 100644
--- a/Source/core/rendering/RenderView.cpp
+++ b/Source/core/rendering/RenderView.cpp
@@ -431,11 +431,6 @@ void RenderView::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
     paintObject(paintInfo, paintOffset);
 }
 
-static inline bool isComposited(RenderObject* object)
-{
-    return object->hasLayer() && toRenderLayerModelObject(object)->layer()->isComposited();
-}
-
 static inline bool rendererObscuresBackground(RenderObject* rootObject)
 {
     if (!rootObject)
@@ -447,7 +442,7 @@ static inline bool rendererObscuresBackground(RenderObject* rootObject)
         || style->hasTransform())
         return false;
 
-    if (isComposited(rootObject))
+    if (rootObject->compositingState() == PaintsIntoOwnBacking)
         return false;
 
     const RenderObject* rootRenderer = rootObject->rendererForRootBackground();