The chromium team was happy to share this week-end with the rest of the community that Chrome OS (BlueZ 5.x) is now qualified as a Host Subsystem for Bluetooth 4.0 & Low Energy.
It basically means Chrome devices support: - Bluetooth 4.0¹ (aka Bluetooth Smart) - Bluetooth Low Energy² (previously called Wibree) - A2DP High-definition Audio³
For information, if you've enabled the Developer Mode⁴ on your Chrome Device, you can open a Chrome OS Shell and type bluetoothctl to enter a Bluetooth shell and type show. There, it should display some cool information about your Chrome device.
For instance, I learnt some geeky stuff by reading the modalias line on my Chromebook Pixel on Dev Channel: Vendor ID: 00E0 (Google) Product ID: 240A (Always start with "24", the Chromium Atomic Number) Device ID: 0400 (Bluetooth version 4.0)