WIP for display item list backed by ListContainer

Source/platform/graphics/paint/Transform3DDisplayItem.h

Index: Source/platform/graphics/paint/Transform3DDisplayItem.h
diff --git a/Source/platform/graphics/paint/Transform3DDisplayItem.h b/Source/platform/graphics/paint/Transform3DDisplayItem.h
index 0da46241de9dc02f44311b9b9448bb66c58e78c6..5f458f34407a01d83d6fc729028f4c9f35f31ad4 100644
--- a/Source/platform/graphics/paint/Transform3DDisplayItem.h
+++ b/Source/platform/graphics/paint/Transform3DDisplayItem.h
@@ -13,18 +13,11 @@
 namespace blink {
 
 class PLATFORM_EXPORT BeginTransform3DDisplayItem : public PairedBeginDisplayItem {
-    WTF_MAKE_FAST_ALLOCATED(BeginTransform3DDisplayItem);
 public:
-    static PassOwnPtr<BeginTransform3DDisplayItem> create(const DisplayItemClientWrapper& client, DisplayItem::Type type, const TransformationMatrix& transform)
+    void setNew(const TransformationMatrix& transform)
     {
-        return adoptPtr(new BeginTransform3DDisplayItem(client, type, transform));
-    }
-
-    BeginTransform3DDisplayItem(const DisplayItemClientWrapper& client, DisplayItem::Type type, const TransformationMatrix& transform)
-        : PairedBeginDisplayItem(client, type)
-        , m_transform(transform)
-    {
-        ASSERT(DisplayItem::isTransform3DType(type));
+        m_transform = transform;
+        ASSERT(DisplayItem::isTransform3DType(type()));
     }
 
     virtual void replay(GraphicsContext&) override;
@@ -33,24 +26,11 @@ public:
     const TransformationMatrix& transform() const { return m_transform; }
 
 private:
-    const TransformationMatrix m_transform;
-    FloatPoint3D m_transformOrigin;
+    TransformationMatrix m_transform;
 };
 
 class PLATFORM_EXPORT EndTransform3DDisplayItem : public PairedEndDisplayItem {
-    WTF_MAKE_FAST_ALLOCATED(EndTransform3DDisplayItem);
 public:
-    static PassOwnPtr<EndTransform3DDisplayItem> create(const DisplayItemClientWrapper& client, DisplayItem::Type type)
-    {
-        return adoptPtr(new EndTransform3DDisplayItem(client, type));
-    }
-
-    EndTransform3DDisplayItem(const DisplayItemClientWrapper& client, DisplayItem::Type type)
-        : PairedEndDisplayItem(client, type)
-    {
-        ASSERT(DisplayItem::isEndTransform3DType(type));
-    }
-
     virtual void replay(GraphicsContext&) override;
     virtual void appendToWebDisplayItemList(WebDisplayItemList*) const override;