Blink-side contiguous allocation of display items.

Source/core/paint/SVGClipPainter.cpp

 // Copyright 2015 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/SVGClipPainter.h"
 
 #include "core/dom/ElementTraversal.h"
 #include "core/layout/svg/LayoutSVGResourceClipper.h"
 #include "core/layout/svg/SVGResources.h"
@@ skipping 83 matching lines @@
 
     return true;
 }
 
 void SVGClipPainter::postApplyStatefulResource(const LayoutObject& target, GraphicsContext* context, ClipperState& clipperState)
 {
     switch (clipperState) {
     case ClipperAppliedPath:
         // Path-only clipping, no layers to restore but we need to emit an end to the clip path display item.
         if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
-            if (context->displayItemList()->displayItemConstructionIsDisabled())
-                return;
-            context->displayItemList()->add(EndClipPathDisplayItem::create(target));
+            if (!context->displayItemList()->displayItemConstructionIsDisabled())
+                context->displayItemList()->createAndAppendIfNeeded<EndClipPathDisplayItem>(target);
         } else {
             EndClipPathDisplayItem endClipPathDisplayItem(target);
             endClipPathDisplayItem.replay(*context);
         }
         break;
     case ClipperAppliedMask:
         // Transfer content -> clip mask (SrcIn)
         CompositingRecorder::endCompositing(*context, target);
 
         // Transfer clip mask -> bg (SrcOver)
@@ skipping 15 matching lines @@
     if (drawingRecorder.canUseCachedDrawing())
         return;
 
     context->save();
     context->concatCTM(contentTransformation);
     context->drawPicture(clipContentPicture.get());
     context->restore();
 }
 
 }