Shell of implementation for embedded windows. At this point this is

views/widget/widget.h

Index: views/widget/widget.h
diff --git a/views/widget/widget.h b/views/widget/widget.h
index 372b5a8147e04e211e3531d822c00132e8a6194c..9af648158be96a5c2b53a11bc3bd2c45ff0973d7 100644
--- a/views/widget/widget.h
+++ b/views/widget/widget.h
@@ -486,11 +486,9 @@ class VIEWS_API Widget : public internal::NativeWidgetDelegate,
     return non_client_view_ ? non_client_view_->client_view() : NULL;
   }
 
-#if defined(UNIT_TEST)
-  static void set_compositor_factory(ui::Compositor*(*factory)()) {
+  static void set_compositor_factory_for_testing(ui::Compositor*(*factory)()) {
     compositor_factory_ = factory;
   }
-#endif
   static ui::Compositor* (*compositor_factory())() {
     return compositor_factory_;
   }