Adding a new window type for frameless non-transient top level windows, used by ChromeOS' window ...

views/widget/widget.h

Index: views/widget/widget.h
===================================================================
--- views/widget/widget.h	(revision 88473)
+++ views/widget/widget.h	(working copy)
@@ -94,6 +94,8 @@
   struct InitParams {
     enum Type {
       TYPE_WINDOW,      // A Window, like a frame window.
+      TYPE_WINDOW_FRAMELESS,

[Daniel Erat, 2011/06/09 05:40:22]

Naming suggestion: TYPE_WINDOW_UNMANAGED?  That's much more accurate for X, at
least (override-redirect windows are never decorated, but it's also possible to
disable decorations on windows that are still being managed by the window
manager).

I don't know much about the subtleties of WS_POPUP, and
http://msdn.microsoft.com/en-us/library/ms632600(v=vs.85).aspx is useless.  I'm
less excited about something like TYPE_WINDOW_FLOATING, but still prefer it to
_FRAMELESS.

[Daniel Erat, 2011/06/09 11:23:43]

Whoops, disregard this, of course.  For some reason, I'm more awake at 4 a.m.
than I was when I wrote this comment. :-/

http://developer.gnome.org/gtk/2.24/GtkWindow.html#gtk-window-set-decorated
could be used to get _FRAMELESS to behave as advertised on window managers that
typically draw decorations around windows.

+                        // An undecorated Window.
       TYPE_CONTROL,     // A control, like a button.
       TYPE_POPUP,       // An undecorated Window, with transient properties.
       TYPE_MENU         // An undecorated Window, with transient properties