* Electron version: 1.4.12
* Operating system: OSX 10.11

If a BrowserWindow is created in full screen mode (fullScreen: true), but programmatically enters and exits kiosk mode (setKiosk(false)), I would expect the app to stay fullScreen at all times.  

This issue appears to be in **NativeWindowMac::SetKiosk(bool kiosk)**. It calls SetFullScreen(true) when entering kiosk and SetFullScreen(false) when leaving kiosk. It would be nice if a check was made to see if the window was already full screen and then just skip these calls. This would allow more graceful kiosking for full screen apps.  


atom/browser/native_window_mac.h
NORMAL,
    HIDDEN,
    HIDDEN_INSET,
  };
  TitleBarStyle title_bar_style() const { return title_bar_style_; }
  bool zoom_to_page_width() const { return zoom_to_page_width_; }
 protected:
  
  
  std::vector<gfx::Rect> CalculateNonDraggableRegions(
      const std::vector<DraggableRegion>& regions, int width, int height);
 private:
  
  gfx::Rect ContentBoundsToWindowBounds(const gfx::Rect& bounds);