Currently the source of Roboto and fallback fonts is hard-coded to fonts.google.com. However, sometimes it is not possible to use that service. Network can be blocked or increase test flakiness, or that service may not be desirable for whatever reasons. The web engine already precomputes the fallback font bundle and puts it on the CIPD and uses it in tests. We can extend this to production app builds as well.

See also b/296269837