Welcome to ThoriumOS!
ThoriumOS aims to produce a ChromiumOS image similar to CloudReady (now ChromeOS Flex), with extra stuff including:
‣ Kernel configuration and Linux firmware to support as many devices as possible, extra packages for useful command line features, and some useful bash aliases.
‣ Widevine (needed for Netflix, etc.), Google Sync, and Google DriveFS integration, which are normally excluded from ChromiumOS images.
‣ And of course, Thorium browser, with the compiler optimizations of Thorium applied to the whole OS!