Why does the Googlebook exist?

Google announced its new Googlebook laptop platform yesterday, and so far I've been left asking, "Why?" Why is Google blowing up its Chromebook and ChromeOS platform for this ? I've been excited by the prospect of Android and ChromeOS unifying under the long-rumored Aluminium OS . The theory was that Aluminium might unite Android and ChromeOS under one house, simultaneously turning Android phones into portable Chromebook desktops , fixing the mess that is Android tablets, and broadening the scop