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.h
TaskbarHost taskbar_host_;
  
  bool enabled_a11y_support_;
  
  bool thick_frame_;
  
  gfx::Rect restore_bounds_;
  
  base::win::ScopedHICON window_icon_;
  base::win::ScopedHICON app_icon_;
#endif
  
  std::unique_ptr<views::UnhandledKeyboardEventHandler> keyboard_event_handler_;
  
  accelerator_util::AcceleratorTable accelerator_table_;
  
  int disable_count_;
  bool use_content_size_;
  bool movable_;
  bool resizable_;
  bool maximizable_;
  bool minimizable_;
  bool fullscreenable_;
  std::string title_;
  gfx::Size widget_size_;
  DISALLOW_COPY_AND_ASSIGN(NativeWindowViews);
};
}  
#endif