[Slimming Paint] Track clip renderers

Source/core/paint/ClipRecorder.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ClipRecorder_h
 #define ClipRecorder_h
 
 #include "core/paint/ViewDisplayList.h"
 #include "core/rendering/PaintPhase.h"
+#include "core/rendering/RenderLayerModelObject.h"
 #include "platform/geometry/RoundedRect.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class ClipRect;
 class GraphicsContext;
-class RenderObject;
-class RenderLayer;
 
 class ClipDisplayItem : public DisplayItem {
 public:
-    ClipDisplayItem(RenderObject* renderer, RenderLayer*, Type type, IntRect clipRect)
+    ClipDisplayItem(const RenderLayerModelObject* renderer, Type type, IntRect clipRect)
         : DisplayItem(renderer, type), m_clipRect(clipRect) { }
 
     Vector<RoundedRect>& roundedRectClips() { return m_roundedRectClips; }
 
 private:
     virtual void replay(GraphicsContext*) override;
 
     IntRect m_clipRect;
     Vector<RoundedRect> m_roundedRectClips;
 #ifndef NDEBUG
     virtual WTF::String asDebugString() const override;
 #endif
 };
 
 class EndClipDisplayItem : public DisplayItem {
 public:
-    EndClipDisplayItem() : DisplayItem(0, EndClip) { }
+    EndClipDisplayItem(const RenderLayerModelObject* renderer) : DisplayItem(renderer, EndClip) { }
 
 private:
     virtual void replay(GraphicsContext*) override;
 };
 
 class ClipRecorder {
 public:
-    explicit ClipRecorder(RenderLayer*, GraphicsContext*, DisplayItem::Type, const ClipRect&);
+    explicit ClipRecorder(const RenderLayerModelObject*, GraphicsContext*, DisplayItem::Type, const ClipRect&);
     void addRoundedRectClip(const RoundedRect&);
 
     ~ClipRecorder();
 
 private:
     ClipDisplayItem* m_clipDisplayItem;
     GraphicsContext* m_graphicsContext;
-    RenderLayer* m_renderLayer;
+    const RenderLayerModelObject* m_renderer;
 };
 
 } // namespace blink
 
 #endif // ViewDisplayList_h