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
Emit("blur");
}
void Window::OnWindowFocus() {
  Emit("focus");
}
void Window::OnWindowShow() {
  Emit("show");
}
void Window::OnWindowHide() {
  Emit("hide");
}
void Window::OnReadyToShow() {
  Emit("ready-to-show");
}
void Window::OnWindowMaximize() {
  Emit("maximize");
}
void Window::OnWindowUnmaximize() {
  Emit("unmaximize");
}
void Window::OnWindowMinimize() {
  Emit("minimize");
}
void Window::OnWindowRestore() {
  Emit("restore");
}
void Window::OnWindowResize() {
  Emit("resize");
}
void Window::OnWindowMove() {