WIP for display item list backed by ListContainer

Source/platform/graphics/paint/TransformDisplayItem.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 TransformDisplayItem_h
 #define TransformDisplayItem_h
 
 #include "platform/graphics/paint/DisplayItem.h"
 #include "platform/transforms/AffineTransform.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
 class PLATFORM_EXPORT BeginTransformDisplayItem : public PairedBeginDisplayItem {
-    WTF_MAKE_FAST_ALLOCATED(BeginTransformDisplayItem);
 public:
-    static PassOwnPtr<BeginTransformDisplayItem> create(const DisplayItemClientWrapper& client, const AffineTransform& transform)
+    void setNew(const AffineTransform& transform)
     {
-        return adoptPtr(new BeginTransformDisplayItem(client, transform));
+        m_transform = transform;
     }
 
-    BeginTransformDisplayItem(const DisplayItemClientWrapper& client, const AffineTransform& transform)
-        : PairedBeginDisplayItem(client, BeginTransform)
-        , m_transform(transform) { }
-
     virtual void replay(GraphicsContext&) override;
     virtual void appendToWebDisplayItemList(WebDisplayItemList*) const override;
 
 private:
 #ifndef NDEBUG
     virtual void dumpPropertiesAsDebugString(WTF::StringBuilder&) const override final;
 #endif
 
-    const AffineTransform m_transform;
+    AffineTransform m_transform;
 };
 
 class PLATFORM_EXPORT EndTransformDisplayItem : public PairedEndDisplayItem {
-    WTF_MAKE_FAST_ALLOCATED(EndTransformDisplayItem);
 public:
-    static PassOwnPtr<EndTransformDisplayItem> create(const DisplayItemClientWrapper& client)
-    {
-        return adoptPtr(new EndTransformDisplayItem(client));
-    }
-
-    EndTransformDisplayItem(const DisplayItemClientWrapper& client)
-        : PairedEndDisplayItem(client, EndTransform) { }
-
     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 otherType == BeginTransform; }
 #endif
 };
 
 } // namespace blink
 
 #endif // TransformDisplayItem_h