If the first layers update doesn't require a draw target, the compositor's thread ID won't be set and NotifyPaintComplete fails on an over-aggressive assertion.
Attachment #9018822 - Flags: review?(nical.bugzilla)
Attachment #9018822 - Flags: review?(nical.bugzilla) → review+
Pushed by firstname.lastname@example.org: https://hg.mozilla.org/integration/mozilla-inbound/rev/5a812d8c724e Relax compositor thread ID assertion, r=nical.
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