WebSerial throws permissions policy Security Error

[gohai]

Nature of issue?

• Existing feature enhancement

Details about the bug:

• Web browser and version: Chrome 92
• Operating System: macOS 11.5
• Steps to reproduce this bug:

Try to use navigator.serial.requestPort() as part of a p5 sketch. This will fail with SecurityError: Failed to execute 'requestPort' on 'Serial': Access to the feature "serial" is disallowed by permissions policy..

Printing document.featurePolicy.allowedFeatures() gives a list that largely matches what is defined in the allow-list in PreviewFrame.jsx, but the term serial (see here) is not currently included.

Feature enhancement details:

WebSerial is currently available on Chrome and Edge, and appears to be a useful way to hook up microcontrollers to p5.

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