As in topic. API currently offers fixed ratio only for Mac but not for Windows
shell/browser/native_window_views.cc
return opacity_;
}
void NativeWindowViews::SetIgnoreMouseEvents(bool ignore, bool forward) {
#if defined(OS_WIN)
  LONG ex_style = ::GetWindowLong(GetAcceleratedWidget(), GWL_EXSTYLE);
  if (ignore)
    ex_style |= (WS_EX_TRANSPARENT | WS_EX_LAYERED);
  else
    ex_style &= ~(WS_EX_TRANSPARENT | WS_EX_LAYERED);
  if (layered_)
    ex_style |= WS_EX_LAYERED;
  ::SetWindowLong(GetAcceleratedWidget(), GWL_EXSTYLE, ex_style);
  
  if (!ignore) {
    SetForwardMouseMessages(false);
  } else {
    SetForwardMouseMessages(forward);
  }
#elif defined(USE_X11)
  if (!features::IsUsingOzonePlatform()) {