Speculative revert by sheriff

cc/blink/web_display_item_list_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_display_item_list_impl.h"
 
 #include <vector>
 
 #include "cc/blink/web_filter_operations_impl.h"
 #include "cc/resources/clip_display_item.h"
 #include "cc/resources/clip_path_display_item.h"
 #include "cc/resources/compositing_display_item.h"
 #include "cc/resources/drawing_display_item.h"
 #include "cc/resources/filter_display_item.h"
 #include "cc/resources/float_clip_display_item.h"
 #include "cc/resources/transform_display_item.h"
 #include "skia/ext/refptr.h"
 #include "third_party/WebKit/public/platform/WebFloatRect.h"
 #include "third_party/WebKit/public/platform/WebRect.h"
 #include "third_party/skia/include/core/SkColorFilter.h"
 #include "third_party/skia/include/core/SkPicture.h"
 #include "third_party/skia/include/utils/SkMatrix44.h"
 #include "ui/gfx/geometry/safe_integer_conversions.h"
 #include "ui/gfx/transform.h"
 
 namespace cc_blink {
 
-WebDisplayItemListImpl::WebDisplayItemListImpl(
-    cc::DisplayItemList* display_list)
-    : display_item_list_(display_list) {
+WebDisplayItemListImpl::WebDisplayItemListImpl()
+    : display_item_list_(cc::DisplayItemList::Create()) {
+}
+
+scoped_refptr<cc::DisplayItemList> WebDisplayItemListImpl::ToDisplayItemList() {
+  return display_item_list_;
 }
 
 void WebDisplayItemListImpl::appendDrawingItem(const SkPicture* picture) {
   display_item_list_->AppendItem(cc::DrawingDisplayItem::Create(
       skia::SharePtr(const_cast<SkPicture*>(picture))));
 }
 
 void WebDisplayItemListImpl::appendClipItem(
     const blink::WebRect& clip_rect,
     const blink::WebVector<SkRRect>& rounded_clip_rects) {
@@ skipping 79 matching lines @@
 }
 
 void WebDisplayItemListImpl::appendEndScrollItem() {
   appendEndTransformItem();
 }
 
 WebDisplayItemListImpl::~WebDisplayItemListImpl() {
 }
 
 }  // namespace cc_blink