As in topic. API currently offers fixed ratio only for Mac but not for Windows
shell/browser/native_window_views.cc
const std::string& level,
                                       int relativeLevel) {
  bool level_changed = z_order != widget()->GetZOrderLevel();
  widget()->SetZOrderLevel(z_order);
#if defined(OS_WIN)
  
  behind_task_bar_ = false;
  if (z_order != ui::ZOrderLevel::kNormal) {
    
    
    static const std::vector<std::string> levels = {
        "floating", "torn-off-menu", "modal-panel", "main-menu", "status"};
    behind_task_bar_ = base::Contains(levels, level);
  }
#endif
  MoveBehindTaskBarIfNeeded();
  
  
  if (level_changed)
    NativeWindow::NotifyWindowAlwaysOnTopChanged();
}
ui::ZOrderLevel NativeWindowViews::GetZOrderLevel() {
  return widget()->GetZOrderLevel();
}
void NativeWindowViews::Center() {