Google Cloud SQL is a managed database service, offered by Google, that makes it easy to set-up, maintain, manage and administer MySQL databases on the Google cloud platform.
More information can be found on the Google Cloud Platform website.
From the perspective of Dbvisit Replicate this can basically be treated as a regular MySQL target, and so much of what applies for 'regular' MySQL operations also applies here. Key information around working with MySQL is covered in the user guide under the Non Oracle (target) Replication, Data instantiation for non Oracle (Creating the Starting Point) and Target Database: MySQL sections.