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

Source/platform/graphics/paint/ClipPathDisplayItem.cpp

Index: Source/platform/graphics/paint/ClipPathDisplayItem.cpp
diff --git a/Source/platform/graphics/paint/ClipPathDisplayItem.cpp b/Source/platform/graphics/paint/ClipPathDisplayItem.cpp
index ca5b03852ba1d1e35c5e1def6e32105b15f3decb..ba2cea3ec95a7afdf175e7fcd5194ebbfca7995b 100644
--- a/Source/platform/graphics/paint/ClipPathDisplayItem.cpp
+++ b/Source/platform/graphics/paint/ClipPathDisplayItem.cpp
@@ -7,6 +7,7 @@
 
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/Path.h"
+#include "platform/graphics/paint/DisplayItems.h"
 #include "public/platform/WebDisplayItemList.h"
 #include "third_party/skia/include/core/SkScalar.h"
 
@@ -23,6 +24,12 @@ void BeginClipPathDisplayItem::appendToWebDisplayItemList(WebDisplayItemList* li
     list->appendClipPathItem(m_clipPath, SkRegion::kIntersect_Op, true);
 }
 
+void BeginClipPathDisplayItem::appendByMoving(DisplayItems& destination)
+{
+    destination.emplaceBack<BeginClipPathDisplayItem>(
+        DisplayItemClientWrapperHelper(*this), m_clipPath);
+}
+
 void EndClipPathDisplayItem::replay(GraphicsContext& context)
 {
     context.restore();
@@ -33,6 +40,12 @@ void EndClipPathDisplayItem::appendToWebDisplayItemList(WebDisplayItemList* list
     list->appendEndClipPathItem();
 }
 
+void EndClipPathDisplayItem::appendByMoving(DisplayItems& destination)
+{
+    destination.emplaceBack<EndClipPathDisplayItem>(
+        DisplayItemClientWrapperHelper(*this));
+}
+
 #ifndef NDEBUG
 void BeginClipPathDisplayItem::dumpPropertiesAsDebugString(WTF::StringBuilder& stringBuilder) const
 {