Designating which website icons appear in the row just below the HPPT box in Chrome?

Google Chrome OS

Chrome OS is an operating system based on the Linux kernel and designed to work with web applications and installed applications. Initially, Chrome OS was almost a pure web thin client operating system, with only a handful of "native" applications, but Google gradually began encouraging developers to create "packaged applications", some of which can work offline. App Runtime for Chrome (beta) enables Android applications to run on Chrome OS. Chrome OS is built upon the open source project called Chromium OS which, unlike Chrome OS, can be compiled from the downloaded source code; Chrome OS is the commercial version installed on specific hardware.