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/api/atom_api_window.cc
window_->Close();
}
void Window::Focus() {
  window_->Focus(true);
}
void Window::Blur() {
  window_->Focus(false);
}
bool Window::IsFocused() {
  return window_->IsFocused();
}
void Window::Show() {
  window_->Show();
}
void Window::ShowInactive() {
  
  if (IsModal())
    return;
  window_->ShowInactive();
}
void Window::Hide() {
  window_->Hide();
}
bool Window::IsVisible() {
  return window_->IsVisible();
}
bool Window::IsEnabled() {
  return window_->IsEnabled();
}
void Window::Maximize() {