[Slimming Paint] Blink-side contiguous allocation of display items.

Source/platform/graphics/paint/Transform3DDisplayItem.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 Transform3DDisplayItem_h
 #define Transform3DDisplayItem_h
 
 #include "platform/graphics/paint/DisplayItem.h"
 #include "platform/transforms/TransformationMatrix.h"
 #include "wtf/Assertions.h"
@@ skipping 11 matching lines @@
 
     BeginTransform3DDisplayItem(const DisplayItemClientWrapper& client, DisplayItem::Type type, const TransformationMatrix& transform)
         : PairedBeginDisplayItem(client, type)
         , m_transform(transform)
     {
         ASSERT(DisplayItem::isTransform3DType(type));
     }
 
     virtual void replay(GraphicsContext&) override;
     virtual void appendToWebDisplayItemList(WebDisplayItemList*) const override;
+    virtual void appendByMoving(DisplayItems&) override;
 
     const TransformationMatrix& transform() const { return m_transform; }
 
 private:
     const TransformationMatrix m_transform;
     FloatPoint3D m_transformOrigin;
 };
 
 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;
+    virtual void appendByMoving(DisplayItems&) override;
 
 private:
 #if ENABLE(ASSERT)
     virtual bool isEndAndPairedWith(DisplayItem::Type otherType) const override final
     {
         return DisplayItem::transform3DTypeToEndTransform3DType(otherType) == type();
     }
 #endif
 };
 
 } // namespace blink
 
 #endif // Transform3DDisplayItem_h