We can get the content size and the window size, but not the chrome position.

At the moment we do this:

```
leftBorderWidth = (windowWidth - contentWidth) / 2;
titlebarHeight = windowHeight - (contentHeight + leftBorderWidth);
```

which makes some assumptions so therefore feels a bit wrong.

it would be nice if alongside getContentSize (https://github.com/electron/electron/blob/master/docs/api/browser-window.md#wingetcontentsize) there was a getContentOffset.

I've been looking at the C++ - https://github.com/electron/electron/blob/e05804848f98959d63337aacd9047cd579c5b23f/chromium_src/extensions/browser/app_window/size_constraints.cc and I don't see an easy way to get this information - do you have any ideas or pointers if you accept this as a feature request?

atom/browser/native_window_views.cc
const std::string& description) {
#if defined(OS_WIN)
  taskbar_host_.SetOverlayIcon(GetAcceleratedWidget(), overlay, description);
#endif
}
void NativeWindowViews::SetAutoHideMenuBar(bool auto_hide) {
  menu_bar_autohide_ = auto_hide;
}
bool NativeWindowViews::IsMenuBarAutoHide() {
  return menu_bar_autohide_;
}
void NativeWindowViews::SetMenuBarVisibility(bool visible) {
  if (!menu_bar_ || menu_bar_visible_ == visible)
    return;
  
  if (menu_bar_autohide_)
    menu_bar_->SetAcceleratorVisibility(visible);
  menu_bar_visible_ = visible;
  if (visible) {
    DCHECK_EQ(child_count(), 1);
    AddChildView(menu_bar_.get());
  } else {
    DCHECK_EQ(child_count(), 2);
    RemoveChildView(menu_bar_.get());
  }
  Layout();
}
bool NativeWindowViews::IsMenuBarVisible() {