Google Chrome OS is an upcoming Linux-based, open source operating system designed by Google to work exclusively with web applications.
You’ll need VMware Player to get it running. VirtualBox can also use VMware VMDK images, but it isn’t always perfect.

You can download the image from here:

Part1: http://www.mediafire.com/file/r71bjh1hyzlw3zq/chrome-os-.vmdk.part1.rar

Part2: http://www.mediafire.com/file/3d3512km7ygn3z5/chrome-os-.vmdk.part2.rar

Part3: http://www.mediafire.com/file/fdji8j1uz5m31p4/chrome-os-.vmdk.part3.rar