Alphabet may control both Android and Chrome OS, but a frequent complaint of consumers in the Google-y ecosystem is the lack of synergy between the two platforms. The situation is improving little by little, with Google opening Instant Tethering up to more devices and grinding away on Nearby Sharing. Now it looks like the integration is poised to become much tighter in the future thanks to an upcoming "phone hub" on Chrome OS.
A new addition to the Chromium repository, the underlying code ChromeOS is based on, indicates that a flag will be added to enable a "phone hub." The description for the flag says that it "provides a UI for users to view information about their Android phone and perform phone-side actions within Chrome OS." Google is working on adding these new options in the Connected Devices section of the Chrome OS settings page, and the capabilities appear to include mirroring notifications from your phone, as well as something called "task continuation" — intriguing!
Currently, linking an Android phone to a Chromebook will allow you to use Instant Tethering, the Messages progressive web app, and Smart Unlock (when it actually works). The level of integration pales in comparison to Apple's iMessage, AirDrop, and Handoff. Heck, Windows laptops can place calls via an Android phone's Bluetooth connection with Microsoft's Your Phone app. It's high time for Google to put something like this in place for Chrome OS/Android devices.