Description
When using wgpu master with WebGL2 and MSAA I'm getting: panicked at 'Tex storage 2D multisample is not supported', C:\Users\super\.cargo\registry\src\github.com-1ecc6299db9ec823\glow-0.11.0\src\web_sys.rs:2168:9

Repro steps

See the attached zip of a wasm WebGL2 demo. Unpack, serve, browse, see panic.

Expected vs observed behavior
Expected: no panic. Observed: panic in both Chrome and Firefox. :)

Extra materials
webgl2-multisample-panic.zip

Platform
wgpu master @ ca7ca74, WebGL2, Windows 10