screen.orientation.lock() failed

[sumleo]

Description:

• A-Frame Version: A-Frame master
• Platform / Device: Chrome 74.0.3729.157, Android 8.0.0, Phone:LM-G710
• Reproducible Code Snippet or URL: https://aframe.io/examples/showcase/anime-UI/

Prove:

Reproduce:

1. Enter the url
2. Click the button to enter VR mode