• Bug 1510030 - Implement WebRender backend to run background color ani… 

    …mations on the compositor. r=gw,boris

Differential Revision: https://phabricator.services.mozilla.com/D63604

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/9092c93a4ac6621e8fb255ae5b386046a0524c0a
    @hiikezoe @moz-gfx
    hiikezoe authored and moz-gfx committed Feb 27, 2020
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