### Preflight Checklist
* [x] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
* [x] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
* [x] I have searched the issue tracker for an issue that matches the one I want to file, without success.

### Issue Details

* **Electron Version:**
  * 6.0.0-beta.3
* **Operating System:**
  * Windows 10 (1809)
* **Last Known Working Electron version:**:
  * 5.0.1

### Expected Behavior
Dragging your mouse to the bottom of the screen with a maximized frameless window and a hidden Windows taskbar should make the taskbar appear.

### Actual Behavior
The taskbar does not appear.

### To Reproduce

* Ensure you have Taskbar hiding enabled
![image](https://user-images.githubusercontent.com/144914/57793291-d12d9000-76f5-11e9-8c63-178e928a5358.png)

```sh
$ git clone https://github.com/adill/electron-quick-start -b no-taskbar-unhide
$ npm install
$ npm start || electron .
```

* Move your mouse to the bottom of the screen

### Screenshots

### Additional Information

atom/browser/native_window_views_win.cc
return "media-nexttrack";
    case APPCOMMAND_MEDIA_PREVIOUSTRACK:
      return "media-previoustrack";
    case APPCOMMAND_MEDIA_STOP:
      return "media-stop";
    case APPCOMMAND_MEDIA_PLAY_PAUSE:
      return "media-play-pause";
    case APPCOMMAND_LAUNCH_MAIL:
      return "launch-mail";
    case APPCOMMAND_LAUNCH_MEDIA_SELECT:
      return "launch-media-select";
    case APPCOMMAND_LAUNCH_APP1:
      return "launch-app1";
    case APPCOMMAND_LAUNCH_APP2:
      return "launch-app2";
    case APPCOMMAND_BASS_DOWN:
      return "bass-down";
    case APPCOMMAND_BASS_BOOST:
      return "bass-boost";
    case APPCOMMAND_BASS_UP:
      return "bass-up";
    case APPCOMMAND_TREBLE_DOWN:
      return "treble-down";
    case APPCOMMAND_TREBLE_UP:
      return "treble-up";
    case APPCOMMAND_MICROPHONE_VOLUME_MUTE:
      return "microphone-volume-mute";
    case APPCOMMAND_MICROPHONE_VOLUME_DOWN:
      return "microphone-volume-down";
    case APPCOMMAND_MICROPHONE_VOLUME_UP: