Suggest Standard Gamepad as a fingerprinting mitigation

[nondebug]

Closes #161

The following tasks have been completed:

• [ ] Modified Web platform tests (link to pull request)

Implementation commitment:

• [ ] WebKit (https://bugs.webkit.org/show_bug.cgi?id=)
• [ ] Chromium (https://bugs.chromium.org/p/chromium/issues/detail?id=)
• [ ] Gecko (https://bugzilla.mozilla.org/show_bug.cgi?id=)

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[marcoscaceres]

I can't recall... does anyone implement this strategy for resisting fingerprinting?

[nondebug]

No browser implementations that I know of, but this is essentially how platform APIs like XInput work.

[marcoscaceres]

Ok, cool. If you are happy with the text, feel free to merge.