Google Chrome launched with this user agent:
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/525.13 (KHTML, like Gecko) Chrome/0.2.149.27 Safari/525.13
Traditional web analytics solutions such as Google Analytics will display Chrome visits under the Firefox section. You’ll need to wait for the future updates of your web analytics solution to identify Chrome visits separately.
If you want to see how many people are using Chrome to visit your site, the best is to look into your server logs.