### Issue Details
in frameless windows 
While setting browserview style to draggable by webkit-app-region : drag. the area won't be draggable after that
and it can not move main window 
### Electron Version:
11.0.1
### Operating System:
Windows 10 (1803)
Last Known Working Electron version:
not found
### Expected Behavior
Browser view moves the main window while I set the style of the body or one of the area to
-webkit-app-region: drag;

### Actual Behavior
nothing happen in browserview after styling -webkit-app-region: drag;

I know it is mention that in 11 version it is fixed. but it still dosn't work 

### To Reproduce
https://gist.github.com/pejmanpesyan/8540aad65e7c6980c45f23e5eaafafb9

shell/browser/native_window_views.cc
float scale_factor = display::win::ScreenWin::GetScaleFactorForHWND(hwnd);
  gfx::Rect screen_rect = ScaleToRoundedRect(pixel_bounds, scale_factor);
  screen_rect.set_origin(
      display::win::ScreenWin::DIPToScreenRect(hwnd, pixel_bounds).origin());
  return screen_rect;
}
#endif
class NativeWindowClientView : public views::ClientView {
 public:
  NativeWindowClientView(views::Widget* widget,
                         views::View* root_view,
                         NativeWindowViews* window)
      : views::ClientView(widget, root_view), window_(window) {}
  ~NativeWindowClientView() override = default;
  views::CloseRequestResult OnWindowCloseRequested() override {
    window_->NotifyWindowCloseButtonClicked();
    return views::CloseRequestResult::kCannotClose;
  }
 private:
  NativeWindowViews* window_;
  DISALLOW_COPY_AND_ASSIGN(NativeWindowClientView);
};
}  
NativeWindowViews::NativeWindowViews(const gin_helper::Dictionary& options,