* Electron Version: 3.0.0-beta1
* Operating System (Platform and Version): macOS
* Last known working Electron version: 2.0.2

**Expected Behavior**
```css
html, body, * {
    -webkit-app-region: drag;
    -webkit-user-select: none;
    cursor: default;
}
```
should allow users to move the position of the window by dragging it directly.

**Actual behavior**
The window is not draggable.
The `cursor` and `-webkit-user-select` properties work well.

**To Reproduce**
copy the CSS above, paste it into a frameless app's `<style>` tag, and run the app.

**Screenshots**

**Additional Information**

atom/browser/api/atom_api_browser_window.h
v8::Local<v8::Value> GetWebContents(v8::Isolate* isolate);
 private:
  
  
  void UpdateDraggableRegions(content::RenderFrameHost* rfh,
                              const std::vector<DraggableRegion>& regions);
  
  std::unique_ptr<SkRegion> DraggableRegionsToSkRegion(
      const std::vector<DraggableRegion>& regions);
  
  void ScheduleUnresponsiveEvent(int ms);
  
  void NotifyWindowUnresponsive();
  
  void Cleanup();
  
  
  base::CancelableClosure window_unresponsive_closure_;
#if defined(OS_MACOSX)
  std::vector<DraggableRegion> draggable_regions_;
#endif
  v8::Global<v8::Value> web_contents_;
  api::WebContents* api_web_contents_;
  base::WeakPtrFactory<BrowserWindow> weak_factory_;
  DISALLOW_COPY_AND_ASSIGN(BrowserWindow);
};
}  
}  
#endif