I didn't had noticed that there was a Google Chrome package on Mandriva contrib backports repository. It isn't the official "Google Chrome" version, it is the build of the open source project behind it: chromium. Think of it as OpenOffice is to Sun StarOffice, it's the same stuff but with another name. If you want to try it you just need to enable contrib backports repository (if you doesn't already have done that) on Mandriva Control Center and install the package "chromium-browswer".
I have been using it since last week and let me tell you, it's awesomely fast !! my only worry was the missing extensions, but I noticed that chrome/chromium has extensions too ! and that most of the extensions I use on firefox are also available for chrome/chromium, like xmarks and Web Developer, although I'm not sure if it's from the same author but it has the same features I need.
If you need any help (in spanish), we have been discussing this over at Mandriva-co forum.