I found a way to change Chrome cache directory and size from /home/username/.cache to whatever adding this /opt/google/chrome/google-chrome %U --disk-cache-dir="/tmp" --disk-cacke-size=640000
on the launcher in usr/local/share/application/Google Chrome.desktop, right click properties, Launcer tab, before moving the launcher to the panel. However, there are two problems with this. Every time Chrome gets an update, it changes back the Exec command, and when i open links in Thunderbird, Chrome opens without that option and puts the cache in the above default directory. A better solution?