A few months ago, Google received a patent registration for a patent filed about two years ago, according to which a smartphone would be a removable part of a laptop. A device similar to the Padfone 2, the tablet-smartphone from Asus. This is revealed by the website Android Police.
According to the patent, the phone will provide a wireless connection and additional functions to the computer, and will be able to use the computer's speakers to make calls, and likely integrate with the operating system itself.
It is unclear whether this indicates a desire on Google's part to connect the Chromebook with Android, but it is likely that this is the intention.
It is important to remember that this is a patent registration and not a prototype, so it is not known whether the device will soon or ever go into production.