[whatwg/fullscreen] Report feature policy violations (#138)

This adds support for reporting violations of the fullscreen feature policy, which should only be triggered when a script actually tries to enter fullscreen in a document where that is not allowed. (Checking fullscreenEnabled, for instance, also involves a feature policy check, but would not trigger a violation report)


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<a href="https://whatpr.org/fullscreen/138.html" title="Last updated on Sep 13, 2018, 2:55 PM GMT (517b98d)">Preview</a> | <a href="https://whatpr.org/fullscreen/138/12330bb...517b98d.html" title="Last updated on Sep 13, 2018, 2:55 PM GMT (517b98d)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fullscreen/pull/138

-- Commit Summary --

  * Report feature policy violations

-- File Changes --

    M fullscreen.bs (5)

-- Patch Links --

https://github.com/whatwg/fullscreen/pull/138.patch
https://github.com/whatwg/fullscreen/pull/138.diff

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