This add-on gives the ability to export products from the Google Product catalog.
In the administration panel, go to Add-ons > Manage add-ons and install the Google Export add-on (click on the Install link on the right).
NOTE: The Data Feeds add-on should be installed first because a dependence on the Data feeds add-on is set for Google Export.
NOTE: The Google Export add-on creates a demo feed in the Data feeds add-on that can be used as an example of creating your own feed and exporting it to Google.