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
return window_->IsResizable();
}
void Window::SetMovable(bool movable) {
  window_->SetMovable(movable);
}
bool Window::IsMovable() {
  return window_->IsMovable();
}
void Window::SetMinimizable(bool minimizable) {
  window_->SetMinimizable(minimizable);
}
bool Window::IsMinimizable() {
  return window_->IsMinimizable();
}
void Window::SetMaximizable(bool maximizable) {
  window_->SetMaximizable(maximizable);
}
bool Window::IsMaximizable() {
  return window_->IsMaximizable();
}
void Window::SetFullScreenable(bool fullscreenable) {
  window_->SetFullScreenable(fullscreenable);
}
bool Window::IsFullScreenable() {
  return window_->IsFullScreenable();
}
void Window::SetClosable(bool closable) {
  window_->SetClosable(closable);
}
bool Window::IsClosable() {