First you need to install/upgrade the latest Mylyn snapshot version which is 3.11 from this update site
http://download.eclipse.org/mylyn/releases/latest
Then you need to install the Mylyn Web Template connector from the Mylyn Incubator which is at
http://download.eclipse.org/mylyn/incubator/3.11
After following the above steps you will have a Mylyn installation with Web Template connector in your Eclipse IDE.
The next part is configuring the web template connector to read issues from google code issues. There are lot of articles and posts on how to do this. But the following article was the one which worked for me with the above Mylyn version.
http://alblue.bandlem.com/2009/04/google-code-and-mylyn-redux.html
After configuring it you will be able to read the Google Code issues from Mylyn Task list :)
