Add `nameFrom: heading` to AccName text alt algorithm

[cookiecrook]

Closes https://github.com/w3c/accname/issues/182

Add nameFrom: heading to AccName text alt algorithm

Implementation

• WPT tests: https://github.com/web-platform-tests/interop-accessibility/issues/47
• Implementations:
  • WebKit 257186
  • Gecko 1834463
  • Chromium 1447981

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[cookiecrook]

Dependent upon related ARIA spec change:

• https://github.com/w3c/aria/pull/1860

[MelSumner]

I see that the related ARIA PR is approved, but do we have a merge order? Or is an approval enough to merge this one?

[cookiecrook]

I think @spectranaut wants to wait for all this to happen:

• [x] ARIA PR approved https://github.com/w3c/aria/pull/1860
• [x] AccName PR approved (this one)
• [x] WPT tests written. https://github.com/web-platform-tests/wpt/pull/44490
• [ ] At least 2 of these 3 implementations:
  • [ ] WebKit 257186
  • [ ] Gecko 1834463
  • [ ] Chromium 1447981
• [ ] then finally merge the ARIA and AccName PRs

At least that's my understanding from the outcome of:

• https://github.com/w3c/aria/issues/2055

But @spectranaut please correct me if I'm wrong.

[MelSumner]

This PR has been moved to the mono repo: https://github.com/w3c/aria/pull/2209