Blink-side contiguous allocation of display items.

Source/platform/graphics/paint/DrawingDisplayItem.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "platform/graphics/paint/DrawingDisplayItem.h"
 
 #include "platform/graphics/GraphicsContext.h"
+#include "platform/graphics/paint/DisplayItems.h"
 #include "public/platform/WebDisplayItemList.h"
 
 namespace blink {
 
 void DrawingDisplayItem::replay(GraphicsContext& context)
 {
     if (m_picture)
         context.drawPicture(m_picture.get());
 }
 
 void DrawingDisplayItem::appendToWebDisplayItemList(WebDisplayItemList* list) const
 {
     if (m_picture)
         list->appendDrawingItem(m_picture.get());
 }
 
+void DrawingDisplayItem::appendByMoving(DisplayItems& destination)
+{
+    destination.emplaceBack<DrawingDisplayItem>(
+        DisplayItemClientWrapperHelper(*this),
+        type(), m_picture.release());
+}
+
 bool DrawingDisplayItem::drawsContent() const
 {
     return m_picture;
 }
 
 #ifndef NDEBUG
 void DrawingDisplayItem::dumpPropertiesAsDebugString(WTF::StringBuilder& stringBuilder) const
 {
     DisplayItem::dumpPropertiesAsDebugString(stringBuilder);
     if (m_picture) {
         stringBuilder.append(WTF::String::format(", rect: [%f,%f,%f,%f]",
             m_picture->cullRect().x(), m_picture->cullRect().y(),
             m_picture->cullRect().width(), m_picture->cullRect().height()));
     }
 }
 #endif
 
 }