Bug 1864558 [wpt PR 43133] - Add user gesture checks to showPicker and fullscreen...

Bug 1864558 [wpt PR 43133] - Add user gesture checks to showPicker and fullscreen invoke actions, a=testonly

Automatic update from web-platform-tests
Add user gesture checks to showPicker and fullscreen invoke actions

These were originally absent due to a faulty assumption.
If invokers only worked with trusted input then these checks
wouldn't be needed, but invokers also work with synthetic events.

As currently specced showPicker needs a user gesture check regardless.
Fullscreen actions aren't currently specced but adding gesture checks
matches the JS API equivalents, and removes a bypass for mitigations.

Bug: 1490919
Change-Id: I0b27e7110fc09bd4c8746d8bdddf200360640be9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5019385
Reviewed-by: Mason Freed <masonf@chromium.org>
Commit-Queue: Luke <lukewarlow156@gmail.com>
Cr-Commit-Position: refs/heads/main@{#1225366}

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wpt-commits: fad39cbf5ed7df8c51d8f3aaaaa90f8f1c8366b0
wpt-pr: 43133