The latest chromium stable update (86.0.4240.183) has been rebuilt against the gnome-3-28 extension and is now available for testing in the
candidate/gnome-3-28-extension channel. To get it, issue the following command in a terminal:
snap install|refresh chromium --channel=candidate/gnome-3-28-extension
This revision was built against snapcraft 4.4, taking advantage of the new mechanism to pre-generate font caches at install time (rather than build time), thus speeding up significantly cold boot startup time.
Of interest is the de-duplication of common GNOME libraries and their dependencies, resulting in a much slimmer snap (122MB, versus 252MB when not connecting to the gnome-3-28-1804 platform snap).
Please test and report any regressions here, or by filing a bug. Thanks for your help!
EDIT: for details about the investigation that triggered this change, read Igor’s excellent blog post.