Desktop aura: Expand what the ViewsDelegate can do to new windows.

ui/views/widget/widget.h

Index: ui/views/widget/widget.h
diff --git a/ui/views/widget/widget.h b/ui/views/widget/widget.h
index ac7cf6d69dbd9148c1af6ac023efc0a68f96af38..026748e03168094ba677d419d654324c75a2790b 100644
--- a/ui/views/widget/widget.h
+++ b/ui/views/widget/widget.h
@@ -187,6 +187,8 @@ class VIEWS_EXPORT Widget : public internal::NativeWidgetDelegate,
     // TODO(beng): Figure out if there's a better way to expose this, e.g. get
     // rid of NW subclasses and do this all via message handling.
     DesktopRootWindowHost* desktop_root_window_host;
+    // Whether this window is intended to be a toplevel window with no
+    // attachment to any other window.

[robertshield, 2012/12/14 01:15:58]

I initially found it confusing that a Widget can be top-level but may still have
a non-NULL |parent|. Could you mention that here?

     bool top_level;
     // Only used by NativeWidgetAura. Specifies the type of layer for the
     // aura::Window. Default is LAYER_TEXTURED.