Update from https://crrev.com/306655

cc/layers/content_layer_client.h

 // Copyright 2012 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_LAYERS_CONTENT_LAYER_CLIENT_H_
 #define CC_LAYERS_CONTENT_LAYER_CLIENT_H_
 
 #include "cc/base/cc_export.h"
+#include "cc/resources/display_item_list.h"
 
 class SkCanvas;
 
 namespace gfx {
 class Rect;
 class RectF;
 }
 
 namespace cc {
 
 class CC_EXPORT ContentLayerClient {
  public:
   enum GraphicsContextStatus {
     GRAPHICS_CONTEXT_DISABLED,
     GRAPHICS_CONTEXT_ENABLED
   };
 
   virtual void PaintContents(SkCanvas* canvas,
                              const gfx::Rect& clip,
                              GraphicsContextStatus gc_status) = 0;
 
+  virtual scoped_refptr<DisplayItemList> PaintContentsToDisplayList(
+      const gfx::Rect& clip,
+      GraphicsContextStatus gc_status) = 0;
+
   // If true the layer may skip clearing the background before rasterizing,
   // because it will cover any uncleared data with content.
   virtual bool FillsBoundsCompletely() const = 0;
 
  protected:
   virtual ~ContentLayerClient() {}
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_CONTENT_LAYER_CLIENT_H_