Microsoft Office Web Apps will officially support Google’s Chrome browser with Office 2010 Service Pack 1 for Office and SharePoint. This service pack is expected to ship the end of June 2011.

The Office Web Apps (Word, Excel, PowerPoint, OneNote) are currently supported on IE, Firefox, and Safari. Chrome works just fine but is not officially supported today. What does that mean? Supported at Microsoft means they have done regression testing to make sure it works. Further if there is an issue it will be fixed. If it is unsupported our support group will still take you call and try and help with your configuration issues but there are limits to the steps we will take to get it working. 

For more information about Office 2010 Service Pack 1 – check out this blog entry:
http://blogs.technet.com/b/office_sustained_engineering/archive/2011/05/16/announcing-service-pack-1-for-office-2010-and-sharepoint-2010.aspx