[snap] WebMIDI not working

[Johannes Feulner]

WebMIDI does not work when chromium is installed from snap package. However, it works when installed via apt install.

Chromium version: Version 93.0.4577.82 (Offizieller Build) snap (64-Bit) Channel: stable
OS Version: Ubuntu 20

Steps to reproduce the problem:
1. Execute in brower's console

if (navigator.requestMIDIAccess) {
   navigator.requestMIDIAccess({sysex: false})
      .then(m => alert("WebMIDI ready")) .catch(m =>alert("WebMIDI failed"));
 } else {
     alert("Sorry, no WebMIDI support in your browser.");
 }

What is the expected behavior?
alert: WebMIDI ready

What went wrong?
alert: WebMIDI failed, WebMIDI cannot be used at all

Without the catch-clause the error message is:
Uncaught (in promise) DOMException: Platform dependent initialization failed.

Did this work before? Yes Version 90.0.4430.72 (Offizieller Build) Built on Ubuntu installed via apt install.

See also: https://bugs.chromium.org/p/chromium/issues/detail?id=1254727&q=reporter%3Ajofeux%40gmail.com&can=1