Webgl demos are blank with empty black window on Android phone

[briangavin]

Describe the bug Webgl demos are blank with empty black window on Android phone

To Reproduce Steps to reproduce the behavior:

1. Use Chrome stable for Android
2. https://google.github.io/filament/webgl/helmet.html
3. 3D window is empty black in color.

Using moto g7 Android 10 supports webgl2.

[pixelflinger]

Just tried on S20+, works fine.

[prideout]

@pixelflinger I'm closing this. At the time of this writing, the web helmet demo works on Pixel 6 Chrome and it would be difficult to test our WebGL implementation against every Android device.