feat: allow GUID parameter to avoid systray demotion on Windows (#21891)

* fix: systray icon demotion

Adding support for GUID parameter in Tray API.
In combination with signed binaries this allows to maintain
the position in the systray on Windows.

* unit tests

* make mac and linux compile

shell/browser/ui/tray_icon_gtk.cc

@@ -91,7 +91,7 @@ bool TrayIconGtk::HasClickAction() {
 }
 
 // static
-TrayIcon* TrayIcon::Create() {
+TrayIcon* TrayIcon::Create(base::Optional<UUID> guid) {
   return new TrayIconGtk;
 }