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

Source/platform/graphics/paint/FilterDisplayItem.cpp

Index: Source/platform/graphics/paint/FilterDisplayItem.cpp
diff --git a/Source/platform/graphics/paint/FilterDisplayItem.cpp b/Source/platform/graphics/paint/FilterDisplayItem.cpp
index a2c46ced8ddc360b93853d9ee2b49813e58586c7..398d15be41f931c2666ee9aca31fb531c7f7c303 100644
--- a/Source/platform/graphics/paint/FilterDisplayItem.cpp
+++ b/Source/platform/graphics/paint/FilterDisplayItem.cpp
@@ -6,6 +6,7 @@
 #include "platform/graphics/paint/FilterDisplayItem.h"
 
 #include "platform/graphics/GraphicsContext.h"
+#include "platform/graphics/paint/DisplayItems.h"
 #include "public/platform/WebDisplayItemList.h"
 
 namespace blink {
@@ -49,6 +50,15 @@ void BeginFilterDisplayItem::appendToWebDisplayItemList(WebDisplayItemList* list
     list->appendFilterItem(*m_webFilterOperations, m_bounds);
 }
 
+void BeginFilterDisplayItem::appendByMoving(DisplayItems& destination)
+{
+    destination.emplaceBack<BeginFilterDisplayItem>(
+        DisplayItemClientWrapperHelper(*this),
+        m_imageFilter.release(),
+        m_bounds,
+        m_webFilterOperations.release());
+}
+
 bool BeginFilterDisplayItem::drawsContent() const
 {
     // A filter with no inputs must produce its own content.
@@ -75,4 +85,10 @@ void EndFilterDisplayItem::appendToWebDisplayItemList(WebDisplayItemList* list)
     list->appendEndFilterItem();
 }
 
+void EndFilterDisplayItem::appendByMoving(DisplayItems& destination)
+{
+    destination.emplaceBack<EndFilterDisplayItem>(
+        DisplayItemClientWrapperHelper(*this));
+}
+
 } // namespace blink