cc: Make DisplayItemList::Append replay into an SkPicture

cc/test/fake_content_layer_client.h

Index: cc/test/fake_content_layer_client.h
diff --git a/cc/test/fake_content_layer_client.h b/cc/test/fake_content_layer_client.h
index a4ecc590ea380b81600df28abdb8bbe2c8119b43..d01bbd108586229bde77c6758b82fc21840c8200 100644
--- a/cc/test/fake_content_layer_client.h
+++ b/cc/test/fake_content_layer_client.h
@@ -40,7 +40,8 @@ class FakeContentLayerClient : public ContentLayerClient {
   void PaintContents(SkCanvas* canvas,
                      const gfx::Rect& rect,
                      PaintingControlSetting painting_control) override;
-  scoped_refptr<DisplayItemList> PaintContentsToDisplayList(
+  void PaintContentsToDisplayList(
+      DisplayItemList* display_list,
       const gfx::Rect& clip,
       PaintingControlSetting painting_control) override;
   bool FillsBoundsCompletely() const override;