Just to provide an update here, I have a WIP patch series for this and I've been working on greening it up on Try. Latest Try push is here: https://treeherder.mozilla.org/#/jobs?repo=try&tier=1&revision=1aa83d314ab433af32620a45d844a723ea398ccf As you can see there are still a lot of failures, especially on Android.
Bug 1556556 Comment 15 Edit History
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Just to provide an update here, I have a WIP patch series for this and I've been working on greening it up on Try. Latest Try push is here: https://treeherder.mozilla.org/#/jobs?repo=try&tier=1&revision=1aa83d314ab433af32620a45d844a723ea398ccf As you can see there are still a lot of failures, especially on Android, but it's greener than previous iterations (like [this one](https://treeherder.mozilla.org/#/jobs?repo=try&tier=1&revision=a205895d886c2bf0a23bbdbb420a6afe9f3a6f11)).