Android has been a 64-bit OS for some time now. However, this transition has not resulted in a wholesale switch to the same in all apps. Nevertheless, Chrome has finally shown signs of migrating to this platform, starting with its newest Dev and Canary versions.
https://www.notebookcheck.net/Chrome-for-Android-upgrades-to-64-bit-in-its-last-few-versions.479633.0.html