cc: De-special-case SurfaceLayer code

ui/compositor/layer.cc

Index: ui/compositor/layer.cc
diff --git a/ui/compositor/layer.cc b/ui/compositor/layer.cc
index 8e6138549251fe4adfee427cd6283498c2d8af42..d93b603475acdeabdfb3b3aac9905444525232cc 100644
--- a/ui/compositor/layer.cc
+++ b/ui/compositor/layer.cc
@@ -177,9 +177,13 @@ std::unique_ptr<Layer> Layer::Clone() const {
     clone->SetAlphaShape(base::MakeUnique<SkRegion>(*alpha_shape_));
 
   // cc::Layer state.
-  if (surface_layer_ && surface_layer_->primary_surface_info().is_valid()) {
-    clone->SetShowPrimarySurface(surface_layer_->primary_surface_info(),
-                                 surface_layer_->surface_reference_factory());
+  if (surface_layer_) {
+    if (surface_layer_->primary_surface_info().is_valid()) {
+      clone->SetShowPrimarySurface(surface_layer_->primary_surface_info(),
+                                   surface_layer_->surface_reference_factory());
+    }
+    if (surface_layer_->fallback_surface_info().is_valid())
+      clone->SetFallbackSurface(surface_layer_->fallback_surface_info());
   } else if (type_ == LAYER_SOLID_COLOR) {
     clone->SetColor(GetTargetColor());
   }