@bpeersmoz @moz-gfx
Bug 1605283 - Improve support for invalidation debugging and testing …
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ba5dd28 
…r=nataliaCs

Differential Revision: https://phabricator.services.mozilla.com/D61207

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/388a4d04e91159527a69fa1e3d2a91e7155247aa