WIP for display item list backed by ListContainer

Source/platform/graphics/paint/FloatClipDisplayItem.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 FloatClipDisplayItem_h
 #define FloatClipDisplayItem_h
 
 #include "platform/PlatformExport.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/graphics/paint/DisplayItem.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
 class RoundedRect;
 
 class PLATFORM_EXPORT FloatClipDisplayItem : public PairedBeginDisplayItem {
-    WTF_MAKE_FAST_ALLOCATED(FloatClipDisplayItem);
 public:
-    static PassOwnPtr<FloatClipDisplayItem> create(const DisplayItemClientWrapper& client, Type type, const FloatRect& clipRect)
+    void setNew(FloatRect& clipRect)
     {
-        return adoptPtr(new FloatClipDisplayItem(client, type, clipRect));
-    }
-
-    FloatClipDisplayItem(const DisplayItemClientWrapper& client, Type type, const FloatRect& clipRect)
-        : PairedBeginDisplayItem(client, type)
-        , m_clipRect(clipRect)
-    {
-        ASSERT(isFloatClipType(type));
+        m_clipRect = clipRect;
+        ASSERT(isFloatClipType(type()));
     }
 
     virtual void replay(GraphicsContext&) override;
     virtual void appendToWebDisplayItemList(WebDisplayItemList*) const override;
 
 private:
 #ifndef NDEBUG
     virtual void dumpPropertiesAsDebugString(WTF::StringBuilder&) const override;
 #endif
 
     FloatRect m_clipRect;
 };
 
 class PLATFORM_EXPORT EndFloatClipDisplayItem : public PairedEndDisplayItem {
-    WTF_MAKE_FAST_ALLOCATED(EndFloatClipDisplayItem);
 public:
-    static PassOwnPtr<EndFloatClipDisplayItem> create(const DisplayItemClientWrapper& client, Type type)
-    {
-        return adoptPtr(new EndFloatClipDisplayItem(client, type));
-    }
-
-    EndFloatClipDisplayItem(const DisplayItemClientWrapper& client, Type type)
-        : PairedEndDisplayItem(client, type)
-    {
-        ASSERT(isEndFloatClipType(type));
-    }
-
     virtual void replay(GraphicsContext&) override;
     virtual void appendToWebDisplayItemList(WebDisplayItemList*) const override;
 
 private:
 #if ENABLE(ASSERT)
     virtual bool isEndAndPairedWith(DisplayItem::Type otherType) const override final { return DisplayItem::isFloatClipType(otherType); }
 #endif
 };
 
 } // namespace blink
 
 #endif // FloatClipDisplayItem_h