Sync web-platform-tests PR 21427 into mozilla-central (this bug is closed when the sync is complete).

PR: https://github.com/web-platform-tests/wpt/pull/21427
Details from upstream follow.

autofoolip <auto@foolip.org> wrote:

Update interfaces/media-capabilities.idl

This PR was automatically created by a bot.

Before merging, please check that any tests that depend on the updated IDL files still work.

If additional changes are needed, please manually create another PR based on this one.

See the README for how the IDL files in this directory are used.

<hr>

Source: https://github.com/tidoust/reffy-reports/blob/3ecc45e/ed/idl/media-capabilities.idl
Build: https://travis-ci.org/tidoust/reffy-reports/builds/641928781

CI Results

Ran 13 Firefox configurations based on mozilla-central, and Firefox, Chrome, and Safari on GitHub CI

Total 44 tests

Status Summary

Firefox

OK : 2
PASS: 76[GitHub] 118[Gecko-android-em-7.0-x86_64-debug-geckoview, Gecko-android-em-7.0-x86_64-opt-geckoview, Gecko-linux1804-64-asan-opt, Gecko-linux1804-64-debug, Gecko-linux1804-64-opt, Gecko-linux1804-64-qr-debug, Gecko-linux1804-64-qr-opt, Gecko-windows10-64-debug, Gecko-windows10-64-opt, Gecko-windows10-64-qr-debug, Gecko-windows10-64-qr-opt, Gecko-windows7-32-debug, Gecko-windows7-32-opt]

Chrome

OK : 2
PASS: 76

Safari

OK : 2
PASS: 57
FAIL: 19

Links

Gecko CI (Treeherder)
GitHub PR Head
GitHub PR Base

https://hg.mozilla.org/mozilla-central/rev/d15d0703de81