[whatwg/dom] Record timing info for event handling. (PR #1267)

This feeds into "Long Animation Frame" timing.

- [x] At least two implementers are interested (and none opposed):
   * Chromium (implemented)
   * Gecko (https://github.com/mozilla/standards-positions/issues/929)
- [x] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * See https://wpt.fyi/results/long-animation-frame/tentative/l
- [x] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chromium: already implemented
   * Gecko: https://bugzilla.mozilla.org/show_bug.cgi?id=1348405
   * WebKit: https://bugs.webkit.org/show_bug.cgi?id=270913
- [x] [MDN issue](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) is filed: https://github.com/mdn/mdn/issues/535
- [x] The top of this comment includes a [clear commit message](https://github.com/whatwg/meta/blob/main/COMMITTING.md) to use. <!-- If you created this PR from a single commit, Github copied its message. Otherwise, you need to add a commit message yourself. -->

(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/1267

-- Commit Summary --

  * Record timing info for event handling.

-- File Changes --

    M dom.bs (3)

-- Patch Links --

https://github.com/whatwg/dom/pull/1267.patch
https://github.com/whatwg/dom/pull/1267.diff

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