• 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/087518046b0c65aebc0c976bf2f736acf7cd4a89
    @hiikezoe @moz-gfx
    hiikezoe authored and moz-gfx committed Feb 27, 2020
    b2bc0a8