Bug 1741584 - Add a profile event marker for the number of bytes and items uploaded. r=gfx-reviewers,jrmuizel
Bug 1741584 - Add a profile event marker for the number of bytes and items uploaded. r=gfx-reviewers,jrmuizel

Differential Revision: https://phabricator.services.mozilla.com/D131395

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/b475f14c7de2c3f225cd9d1675abc760c37b618d

servo/webrender,servo/webrender,servo/webrender,servo/webrender,servo/webrender,servo/webrender