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)
  Microsoft::WRL::ComPtr<ITaskbarList> taskbar;
  if (FAILED(::CoCreateInstance(CLSID_TaskbarList, nullptr,
                                CLSCTX_INPROC_SERVER,
                                IID_PPV_ARGS(&taskbar))) ||
      FAILED(taskbar->HrInit()))
    return;
  if (skip) {
    taskbar->DeleteTab(GetAcceleratedWidget());
  } else {
    taskbar->AddTab(GetAcceleratedWidget());
    taskbar_host_.RestoreThumbarButtons(GetAcceleratedWidget());
  }
#elif defined(USE_X11)
  if (!features::IsUsingOzonePlatform()) {
    SetWMSpecState(static_cast<x11::Window>(GetAcceleratedWidget()), skip,
                   x11::GetAtom("_NET_WM_STATE_SKIP_TASKBAR"));
  }
#endif
}
void NativeWindowViews::SetSimpleFullScreen(bool simple_fullscreen) {
  SetFullScreen(simple_fullscreen);
}
bool NativeWindowViews::IsSimpleFullScreen() {
  return IsFullscreen();
}
void NativeWindowViews::SetKiosk(bool kiosk) {