Make compositingState explicit

Source/core/rendering/RenderObject.h

Index: Source/core/rendering/RenderObject.h
diff --git a/Source/core/rendering/RenderObject.h b/Source/core/rendering/RenderObject.h
index 2d024a480832f16eade7a90059429977bbed9f5a..f2055c307320318fa56d3176b6865527e7bdcbf4 100644
--- a/Source/core/rendering/RenderObject.h
+++ b/Source/core/rendering/RenderObject.h
@@ -30,6 +30,7 @@
 #include "core/dom/Position.h"
 #include "core/dom/StyleEngine.h"
 #include "core/fetch/ImageResourceClient.h"
+#include "core/rendering/CompositingState.h"
 #include "core/rendering/LayoutIndicator.h"
 #include "core/rendering/PaintPhase.h"
 #include "core/rendering/RenderObjectChildList.h"
@@ -698,7 +699,7 @@ public:
     virtual void addAnnotatedRegions(Vector<AnnotatedRegionValue>&);
     void collectAnnotatedRegions(Vector<AnnotatedRegionValue>&);
 
-    bool isComposited() const;
+    CompositingState compositingState() const;
 
     bool hitTest(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestFilter = HitTestAll);
     virtual void updateHitTestResult(HitTestResult&, const LayoutPoint&);