Implement the framework for the paint property hierarchy

third_party/WebKit/Source/platform/graphics/ContentLayerDelegate.h

Index: third_party/WebKit/Source/platform/graphics/ContentLayerDelegate.h
diff --git a/third_party/WebKit/Source/platform/graphics/ContentLayerDelegate.h b/third_party/WebKit/Source/platform/graphics/ContentLayerDelegate.h
index 968e1073a4b2a35498a253982561b5a7da1314f3..d6bf244fad42f1a983ce34bf2ead41e15ca19a67 100644
--- a/third_party/WebKit/Source/platform/graphics/ContentLayerDelegate.h
+++ b/third_party/WebKit/Source/platform/graphics/ContentLayerDelegate.h
@@ -35,14 +35,14 @@ class SkCanvas;
 
 namespace blink {
 
-class DisplayItemList;
+class PaintArtifact;
 class GraphicsContext;
 class IntRect;
 
 class PLATFORM_EXPORT GraphicsContextPainter {
 public:
     virtual void paint(GraphicsContext&, const IntRect& clip) = 0;
-    virtual DisplayItemList* displayItemList() = 0;
+    virtual PaintArtifact* paintArtifact() = 0;
 
 protected:
     virtual ~GraphicsContextPainter() { }