Blink-side contiguous allocation of display items.

Source/platform/graphics/paint/ScrollDisplayItem.h

Index: Source/platform/graphics/paint/ScrollDisplayItem.h
diff --git a/Source/platform/graphics/paint/ScrollDisplayItem.h b/Source/platform/graphics/paint/ScrollDisplayItem.h
index b3326608608d5d1f8b295d72bd5b2177d549b04a..60986b8a3fffbc8c17fde58a2b57bfa3a3e63aaa 100644
--- a/Source/platform/graphics/paint/ScrollDisplayItem.h
+++ b/Source/platform/graphics/paint/ScrollDisplayItem.h
@@ -7,19 +7,11 @@
 
 #include "platform/geometry/IntSize.h"
 #include "platform/graphics/paint/DisplayItem.h"
-#include "wtf/FastAllocBase.h"
-#include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
 class PLATFORM_EXPORT BeginScrollDisplayItem : public PairedBeginDisplayItem {
-    WTF_MAKE_FAST_ALLOCATED(BeginScrollDisplayItem);
 public:
-    static PassOwnPtr<BeginScrollDisplayItem> create(const DisplayItemClientWrapper& client, Type type, const IntSize& currentOffset)
-    {
-        return adoptPtr(new BeginScrollDisplayItem(client, type, currentOffset));
-    }
-
     BeginScrollDisplayItem(const DisplayItemClientWrapper& client, Type type, const IntSize& currentOffset)
         : PairedBeginDisplayItem(client, type)
         , m_currentOffset(currentOffset)
@@ -29,6 +21,7 @@ public:
 
     virtual void replay(GraphicsContext&) override;
     virtual void appendToWebDisplayItemList(WebDisplayItemList*) const override;
+    void appendByMoving(DisplayItems&) override;
 
 private:
 #ifndef NDEBUG
@@ -39,13 +32,7 @@ private:
 };
 
 class PLATFORM_EXPORT EndScrollDisplayItem : public PairedEndDisplayItem {
-    WTF_MAKE_FAST_ALLOCATED(EndScrollDisplayItem);
 public:
-    static PassOwnPtr<EndScrollDisplayItem> create(const DisplayItemClientWrapper& client, Type type)
-    {
-        return adoptPtr(new EndScrollDisplayItem(client, type));
-    }
-
     EndScrollDisplayItem(const DisplayItemClientWrapper& client, Type type)
         : PairedEndDisplayItem(client, type)
     {
@@ -54,6 +41,7 @@ public:
 
     virtual void replay(GraphicsContext&) override;
     virtual void appendToWebDisplayItemList(WebDisplayItemList*) const override;
+    void appendByMoving(DisplayItems&) override;
 
 private:
 #if ENABLE(ASSERT)