Drop background color optimization for composited layers

LayoutTests/compositing/rtl/rtl-fixed-overflow-scrolled-expected.txt

Index: LayoutTests/compositing/rtl/rtl-fixed-overflow-scrolled-expected.txt
diff --git a/LayoutTests/compositing/rtl/rtl-fixed-overflow-scrolled-expected.txt b/LayoutTests/compositing/rtl/rtl-fixed-overflow-scrolled-expected.txt
index faf0f204381fd53273d062d1ae12b6eab3601996..191add46f3b543e3211a32634d83cc77af7bae84 100644
--- a/LayoutTests/compositing/rtl/rtl-fixed-overflow-scrolled-expected.txt
+++ b/LayoutTests/compositing/rtl/rtl-fixed-overflow-scrolled-expected.txt
@@ -11,6 +11,8 @@
           (position 51.00 50.00)
           (bounds 100.00 100.00)
           (contentsOpaque 1)
+          (drawsContent 1)
+          (backgroundColor #008000)
         )
       )
     )