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

Source/platform/graphics/paint/Transform3DDisplayItem.cpp

Index: Source/platform/graphics/paint/Transform3DDisplayItem.cpp
diff --git a/Source/platform/graphics/paint/Transform3DDisplayItem.cpp b/Source/platform/graphics/paint/Transform3DDisplayItem.cpp
index 0cc06bb5673cd9d6d23ac7ea2e74a69a45ab6081..2c2dca8b98a2505ba89f6ccc494466724e919fbb 100644
--- a/Source/platform/graphics/paint/Transform3DDisplayItem.cpp
+++ b/Source/platform/graphics/paint/Transform3DDisplayItem.cpp
@@ -6,6 +6,7 @@
 #include "platform/graphics/paint/Transform3DDisplayItem.h"
 
 #include "platform/graphics/GraphicsContext.h"
+#include "platform/graphics/paint/DisplayItems.h"
 #include "platform/transforms/AffineTransform.h"
 #include "public/platform/WebDisplayItemList.h"
 
@@ -22,6 +23,12 @@ void BeginTransform3DDisplayItem::appendToWebDisplayItemList(WebDisplayItemList*
     list->appendTransformItem(TransformationMatrix::toSkMatrix44(m_transform));
 }
 
+void BeginTransform3DDisplayItem::appendByMoving(DisplayItems& destination)
+{
+    destination.emplaceBack<BeginTransform3DDisplayItem>(
+        DisplayItemClientWrapperHelper(*this), type(), m_transform);
+}
+
 void EndTransform3DDisplayItem::replay(GraphicsContext& context)
 {
     context.restore();
@@ -32,4 +39,10 @@ void EndTransform3DDisplayItem::appendToWebDisplayItemList(WebDisplayItemList* l
     list->appendEndTransformItem();
 }
 
+void EndTransform3DDisplayItem::appendByMoving(DisplayItems& destination)
+{
+    destination.emplaceBack<EndTransform3DDisplayItem>(
+        DisplayItemClientWrapperHelper(*this), type());
+}
+
 } // namespace blink