Google looks to be laying the foundation to add Android app mirroring support in a future update to Chrome OS. A line of code was spotted in the latest update to Google Play Services for Android and points to tighter integration between Android phones and Chromebooks.
https://www.notebookcheck.net/Google-Services-code-hints-at-plans-to-bring-Android-app-mirroring-on-Chromebooks.542602.0.html