Bug 1642072: Add a red line threshold to the render target GC to prevent memory exhaustion r=gw
Bug 1642072: Add a red line threshold to the render target GC to prevent memory exhaustion r=gw

Differential Revision: https://phabricator.services.mozilla.com/D78072

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/6fbc33061f0de92c70e33981f4853d219d9aaf30

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