As in topic. API currently offers fixed ratio only for Mac but not for Windows
shell/browser/native_window_views.cc
if (!content_view())
    return;
  if (!view) {
    return;
  }
  add_browser_view(view);
  if (view->GetInspectableWebContentsView())
    content_view()->AddChildView(
        view->GetInspectableWebContentsView()->GetView());
}
void NativeWindowViews::RemoveBrowserView(NativeBrowserView* view) {
  if (!content_view())
    return;
  if (!view) {
    return;
  }
  if (view->GetInspectableWebContentsView())
    content_view()->RemoveChildView(
        view->GetInspectableWebContentsView()->GetView());
  remove_browser_view(view);
}
void NativeWindowViews::SetParentWindow(NativeWindow* parent) {