Here’s the quickest way I found to enable flash 10 support on google chrome for x64 linux.

Get the latest version of flash x64 for linux from http://labs.adobe.com/downloads/flashplayer10_64bit.html

Extract the libflashplayer.so file to your chrome plugins directory.
Mine is /opt/google/chrome/plugins

In your launcher for chrome add the following
–enable-plugins %U

That’s the skinny