Speculative revert by sheriff

cc/blink/web_content_layer_impl.cc

 // 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 "cc/blink/web_content_layer_impl.h"
 
 #include "cc/blink/web_display_item_list_impl.h"
 #include "cc/layers/content_layer.h"
 #include "cc/layers/picture_layer.h"
 #include "third_party/WebKit/public/platform/WebContentLayerClient.h"
@@ skipping 54 matching lines @@
 void WebContentLayerImpl::PaintContents(
     SkCanvas* canvas,
     const gfx::Rect& clip,
     cc::ContentLayerClient::PaintingControlSetting painting_control) {
   if (!client_)
     return;
 
   client_->paintContents(canvas, clip, PaintingControlToWeb(painting_control));
 }
 
-void WebContentLayerImpl::PaintContentsToDisplayList(
-    cc::DisplayItemList* display_list,
+scoped_refptr<cc::DisplayItemList>
+WebContentLayerImpl::PaintContentsToDisplayList(
     const gfx::Rect& clip,
     cc::ContentLayerClient::PaintingControlSetting painting_control) {
   if (!client_)
-    return;
+    return cc::DisplayItemList::Create();
 
-  WebDisplayItemListImpl list(display_list);
+  WebDisplayItemListImpl list;
   client_->paintContents(&list, clip, PaintingControlToWeb(painting_control));
+  return list.ToDisplayItemList();
 }
 
 bool WebContentLayerImpl::FillsBoundsCompletely() const {
   return false;
 }
 
 }  // namespace cc_blink