cc: Make DisplayItemList::Append replay into an SkPicture

cc/test/solid_color_content_layer_client.h

Index: cc/test/solid_color_content_layer_client.h
diff --git a/cc/test/solid_color_content_layer_client.h b/cc/test/solid_color_content_layer_client.h
index 1ab4c4d712f091a805b52472e660bd96b89d8ba9..3068f9aeb7d98b156ad0b9f5aee80666201b866f 100644
--- a/cc/test/solid_color_content_layer_client.h
+++ b/cc/test/solid_color_content_layer_client.h
@@ -19,7 +19,8 @@ class SolidColorContentLayerClient : 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;