As in topic. API currently offers fixed ratio only for Mac but not for Windows
shell/browser/native_window_views.cc
#if defined(OS_WIN)
  if (!(::GetWindowLong(GetAcceleratedWidget(), GWL_STYLE) & WS_THICKFRAME)) {
    
    auto display = display::Screen::GetScreen()->GetDisplayNearestWindow(
        GetNativeWindow());
    
    
    return GetBounds() == display.work_area();
  }
#endif
  return widget()->IsMaximized();
}
void NativeWindowViews::Minimize() {
  if (IsVisible())
    widget()->Minimize();
  else
    widget()->native_widget_private()->Show(ui::SHOW_STATE_MINIMIZED,
                                            gfx::Rect());
}
void NativeWindowViews::Restore() {