Speculative revert by sheriff

cc/blink/web_display_item_list_impl.h

 // 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.
 
 #ifndef CC_BLINK_WEB_DISPLAY_ITEM_LIST_IMPL_H_
 #define CC_BLINK_WEB_DISPLAY_ITEM_LIST_IMPL_H_
 
 #include "base/memory/ref_counted.h"
 #include "cc/blink/cc_blink_export.h"
 #include "cc/resources/display_item_list.h"
@@ skipping 13 matching lines @@
 namespace blink {
 class WebFilterOperations;
 struct WebFloatRect;
 struct WebRect;
 }
 
 namespace cc_blink {
 
 class WebDisplayItemListImpl : public blink::WebDisplayItemList {
  public:
-  CC_BLINK_EXPORT WebDisplayItemListImpl(cc::DisplayItemList* display_list);
+  CC_BLINK_EXPORT WebDisplayItemListImpl();
   virtual ~WebDisplayItemListImpl();
 
+  scoped_refptr<cc::DisplayItemList> ToDisplayItemList();
+
   // blink::WebDisplayItemList implementation.
   virtual void appendDrawingItem(const SkPicture*);
   virtual void appendClipItem(
       const blink::WebRect& clip_rect,
       const blink::WebVector<SkRRect>& rounded_clip_rects);
   virtual void appendEndClipItem();
   virtual void appendClipPathItem(const SkPath& clip_path,
                                   SkRegion::Op clip_op,
                                   bool antialias);
   virtual void appendEndClipPathItem();
   virtual void appendFloatClipItem(const blink::WebFloatRect& clip_rect);
   virtual void appendEndFloatClipItem();
   virtual void appendTransformItem(const SkMatrix44& matrix);
   virtual void appendEndTransformItem();
   virtual void appendCompositingItem(float opacity,
                                      SkXfermode::Mode,
                                      SkRect* bounds,
                                      SkColorFilter*);
   virtual void appendEndCompositingItem();
   virtual void appendFilterItem(const blink::WebFilterOperations& filters,
                                 const blink::WebFloatRect& bounds);
   virtual void appendEndFilterItem();
   virtual void appendScrollItem(const blink::WebSize& scrollOffset,
                                 ScrollContainerId);
   virtual void appendEndScrollItem();
 
  private:
-  cc::DisplayItemList* display_item_list_;
+  scoped_refptr<cc::DisplayItemList> display_item_list_;
 
   DISALLOW_COPY_AND_ASSIGN(WebDisplayItemListImpl);
 };
 
 }  // namespace cc_blink
 
 #endif  // CC_BLINK_WEB_DISPLAY_ITEM_LIST_IMPL_H_