Bugzilla

Observations from try run in comment 17:
- `desktop-mode-cleanup.html` does indeed fail in test-verify mode for reasons described in comment 17.
- `desktop-mode.html` fails in test-verify mode in the "Run each test 10 times in one browser" section (and its "in chaos mode" variant), for reasons described in comment 18.

That's probably not-great (particularly for the "real" reftest), so I'm inclined to remove the precondition so that the tests pass verification.

One other observation: both of these tests apparently get skipped in most  test-verify tasks -- they're only run in `test-verify-gpu` verification (which is linux-only).  On other test-verify tasks, the log shows them being skipped/discarded like so:
```
INFO - Per-test run (non-gpu) discarded gpu test layout\reftests\meta-viewport\desktop-mode-cleanup.html (gpu)
INFO - Per-test run (non-gpu) discarded gpu test layout\reftests\meta-viewport\desktop-mode.html (gpu)
WARNING - No tests to verify.
```

Observations from try run in comment 17:
- `desktop-mode-cleanup.html` does indeed fail in test-verify mode for reasons described in comment 17.
- `desktop-mode.html` fails in test-verify mode in the "Run each test 10 times in one browser" section (and its "in chaos mode" variant), for reasons described in comment 18.

Seeing the actual test failures in the Try run, I'm feeling like that's probably not-great (particularly for the "real" reftest `desktop-mode.html`), so I'm inclined to remove the precondition so that the tests pass verification.

One other observation: both of these tests apparently get skipped in most  test-verify tasks -- they're only run in `test-verify-gpu` verification (which is linux-only).  On other test-verify tasks, the log shows them being skipped/discarded like so:
```
INFO - Per-test run (non-gpu) discarded gpu test layout\reftests\meta-viewport\desktop-mode-cleanup.html (gpu)
INFO - Per-test run (non-gpu) discarded gpu test layout\reftests\meta-viewport\desktop-mode.html (gpu)
WARNING - No tests to verify.
```