Bug 1859742 [wpt PR 42597] - Coarsen timestamp for rAF callback and web animations...

Bug 1859742 [wpt PR 42597] - Coarsen timestamp for rAF callback and web animations, a=testonly

Automatic update from web-platform-tests
Coarsen timestamp for rAF callback and web animations

The timestamps exposed by WAAPI and the requestAnimationFrame
callback should be coarsened if the page is cross-origin-isolated.

Using the same coarsening logic in both to ensure that the numbers
are exactly equal.

This has recently been merged into the HTML spec,
and matches Gecko/WebKit.

Bug: 1422926
Change-Id: I750012854d569ad86174bd4711670a2c6569a020
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4952594
Reviewed-by: David Bokan <bokan@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Commit-Queue: Noam Rosenthal <nrosenthal@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1214838}

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wpt-commits: b561be3c42fa48f944c393582baa3a18a6c37841
wpt-pr: 42597