This commit fixes the rendering issue that makes the "must update an
existing annotation" ink editor integration test permafail locally in
Chrome. Note that we already do this for Firefox tests, so this also
improves consistency between the two browsers.
Moreover, improve how we define Chrome options to (similar to their
Firefox counterparts) provide them in a single array, and document the
reasoning for why these options are being set more explicitly.
Fixes#21272.
60591388a8