Sync web-platform-tests PR 38928 into mozilla-central (this bug is closed when the sync is complete).

PR: https://github.com/web-platform-tests/wpt/pull/38928
Details from upstream follow.

Fredrik Söderquist <fs@opera.com> wrote:

Restore check for 'broken.png' in viewport-change.html test

crrev.com/c/3708127 changed the check to check for 'undecodable.png',
but didn't update the actual \<img>/\<source> references in the test -
which seems broken. Restore to the original behavior.

Bug: 1233739
Change-Id: I4f1334b374fc905055b66e639aa33c1ed540edf0
Reviewed-on: https://chromium-review.googlesource.com/4324999
WPT-Export-Revision: 3a90411b0be2988cf9ff37c43e8e5a3e3dcdeb71

CI Results

Ran 0 Firefox configurations based on mozilla-central, and Firefox, Chrome, and Safari on GitHub CI

Total 1 tests and 44 subtests

Status Summary

Firefox

OK : 1
PASS: 40
FAIL: 4

Chrome

OK : 1
PASS: 38
FAIL: 6

Safari

OK : 1
PASS: 38
FAIL: 6

Links

GitHub PR Head
GitHub PR Base

Details

New Tests That Don't Pass

• /html/semantics/embedded-content/the-img-element/environment-changes/viewport-change.html [wpt.fyi]
  • picture: source (max-width:500px) broken image, img broken image, resize to wide: FAIL (Chrome: FAIL, Safari: FAIL)
  • picture: source (max-width:500px) valid image, img broken image, resize to wide: FAIL (Chrome: FAIL, Safari: FAIL)
  • picture: source (max-width:500px) broken image, img broken image, resize to narrow: FAIL (Chrome: FAIL, Safari: FAIL)
  • picture: source (max-width:500px) broken image, img valid image, resize to narrow: FAIL (Chrome: FAIL, Safari: FAIL)

https://hg.mozilla.org/mozilla-central/rev/2e597de25ed5