Blink-side contiguous allocation of display items.

Source/platform/graphics/paint/FixedPositionContainerDisplayItem.h

Index: Source/platform/graphics/paint/FixedPositionContainerDisplayItem.h
diff --git a/Source/platform/graphics/paint/FixedPositionContainerDisplayItem.h b/Source/platform/graphics/paint/FixedPositionContainerDisplayItem.h
index 8b1a948537c3e05cb1c7b83f9c2642ea8f1bfb1a..cc266871b67415eee05b06c8f1479b56941519a0 100644
--- a/Source/platform/graphics/paint/FixedPositionContainerDisplayItem.h
+++ b/Source/platform/graphics/paint/FixedPositionContainerDisplayItem.h
@@ -8,18 +8,11 @@
 #include "platform/geometry/LayoutSize.h"
 #include "platform/graphics/paint/DisplayItem.h"
 #include "wtf/FastAllocBase.h"
-#include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
 class PLATFORM_EXPORT BeginFixedPositionContainerDisplayItem : public PairedBeginDisplayItem {
-    WTF_MAKE_FAST_ALLOCATED(BeginFixedPositionContainerDisplayItem);
 public:
-    static PassOwnPtr<BeginFixedPositionContainerDisplayItem> create(const DisplayItemClientWrapper& client)
-    {
-        return adoptPtr(new BeginFixedPositionContainerDisplayItem(client));
-    }
-
     BeginFixedPositionContainerDisplayItem(const DisplayItemClientWrapper& client)
         : PairedBeginDisplayItem(client, BeginFixedPositionContainer)
     {
@@ -27,16 +20,11 @@ public:
 
     virtual void replay(GraphicsContext&) override final { }
     virtual void appendToWebDisplayItemList(WebDisplayItemList*) const override final;
+    void appendByMoving(DisplayItems&) override;
 };
 
 class PLATFORM_EXPORT EndFixedPositionContainerDisplayItem : public PairedEndDisplayItem {
-    WTF_MAKE_FAST_ALLOCATED(EndFixedPositionContainerDisplayItem);
 public:
-    static PassOwnPtr<EndFixedPositionContainerDisplayItem> create(const DisplayItemClientWrapper& client)
-    {
-        return adoptPtr(new EndFixedPositionContainerDisplayItem(client));
-    }
-
     EndFixedPositionContainerDisplayItem(const DisplayItemClientWrapper& client)
         : PairedEndDisplayItem(client, EndFixedPositionContainer)
     {
@@ -44,6 +32,7 @@ public:
 
     virtual void replay(GraphicsContext&) override final { }
     virtual void appendToWebDisplayItemList(WebDisplayItemList*) const override final;
+    void appendByMoving(DisplayItems&) override;
 
 private:
 #if ENABLE(ASSERT)