Blink-side contiguous allocation of display items.

Source/core/paint/TransformRecorder.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 "core/paint/TransformRecorder.h"
 
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/paint/DisplayItemList.h"
 #include "platform/graphics/paint/TransformDisplayItem.h"
 
 namespace blink {
 
 TransformRecorder::TransformRecorder(GraphicsContext& context, const DisplayItemClientWrapper& client, const AffineTransform& transform)
     : m_context(context)
     , m_client(client)
 {
     m_skipRecordingForIdentityTransform = transform.isIdentity();
 
     if (m_skipRecordingForIdentityTransform)
         return;
 
     if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
         ASSERT(m_context.displayItemList());
         if (m_context.displayItemList()->displayItemConstructionIsDisabled())
             return;
-        m_context.displayItemList()->add(BeginTransformDisplayItem::create(m_client, transform));
+        m_context.displayItemList()->createAndAppendIfNeeded<BeginTransformDisplayItem>(m_client, transform);
     } else {
         BeginTransformDisplayItem beginTransform(m_client, transform);
         beginTransform.replay(m_context);
     }
 }
 
 TransformRecorder::~TransformRecorder()
 {
     if (m_skipRecordingForIdentityTransform)
         return;
 
     if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
         ASSERT(m_context.displayItemList());
         if (m_context.displayItemList()->displayItemConstructionIsDisabled())
             return;
-        m_context.displayItemList()->add(EndTransformDisplayItem::create(m_client));
+        m_context.displayItemList()->createAndAppendIfNeeded<EndTransformDisplayItem>(m_client);
     } else {
         EndTransformDisplayItem endTransform(m_client);
         endTransform.replay(m_context);
     }
 }
 
 } // namespace blink