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("move");
}
void Window::OnWindowMoved() {
  Emit("moved");
}
void Window::OnWindowEnterFullScreen() {
  Emit("enter-full-screen");
}
void Window::OnWindowLeaveFullScreen() {
  Emit("leave-full-screen");
}
void Window::OnWindowScrollTouchBegin() {
  Emit("scroll-touch-begin");
}
void Window::OnWindowScrollTouchEnd() {
  Emit("scroll-touch-end");
}
void Window::OnWindowSwipe(const std::string& direction) {
  Emit("swipe", direction);
}
void Window::OnWindowEnterHtmlFullScreen() {
  Emit("enter-html-full-screen");
}
void Window::OnWindowLeaveHtmlFullScreen() {
  Emit("leave-html-full-screen");
}
void Window::OnRendererUnresponsive() {
  Emit("unresponsive");
}
void Window::OnRendererResponsive() {