Drop background color optimization for composited layers

LayoutTests/compositing/will-change/composited-layers-expected.txt

Index: LayoutTests/compositing/will-change/composited-layers-expected.txt
diff --git a/LayoutTests/compositing/will-change/composited-layers-expected.txt b/LayoutTests/compositing/will-change/composited-layers-expected.txt
index 4caf3b3804d495644799919d895a49494cfb70b7..88607316987ab04f45c7c337ce77e0c228cb3df6 100644
--- a/LayoutTests/compositing/will-change/composited-layers-expected.txt
+++ b/LayoutTests/compositing/will-change/composited-layers-expected.txt
@@ -10,41 +10,57 @@
           (position 60.00 0.00)
           (bounds 50.00 50.00)
           (contentsOpaque 1)
+          (drawsContent 1)
+          (backgroundColor #008000)
         )
         (GraphicsLayer
           (position 120.00 0.00)
           (bounds 50.00 50.00)
           (contentsOpaque 1)
+          (drawsContent 1)
+          (backgroundColor #008000)
         )
         (GraphicsLayer
           (position 180.00 0.00)
           (bounds 50.00 50.00)
           (contentsOpaque 1)
+          (drawsContent 1)
+          (backgroundColor #008000)
         )
         (GraphicsLayer
           (position 240.00 0.00)
           (bounds 50.00 50.00)
           (contentsOpaque 1)
+          (drawsContent 1)
+          (backgroundColor #008000)
         )
         (GraphicsLayer
           (position 0.00 60.00)
           (bounds 50.00 50.00)
           (contentsOpaque 1)
+          (drawsContent 1)
+          (backgroundColor #008000)
         )
         (GraphicsLayer
           (position 60.00 60.00)
           (bounds 50.00 50.00)
           (contentsOpaque 1)
+          (drawsContent 1)
+          (backgroundColor #008000)
         )
         (GraphicsLayer
           (position 120.00 60.00)
           (bounds 50.00 50.00)
           (contentsOpaque 1)
+          (drawsContent 1)
+          (backgroundColor #008000)
         )
         (GraphicsLayer
           (position 180.00 60.00)
           (bounds 50.00 50.00)
           (contentsOpaque 1)
+          (drawsContent 1)
+          (backgroundColor #008000)
         )
       )
     )