Mark, if you'd like to try our version of a "web based IDE that gives you access to work with any code you have in your private Google-hosted git repos", check out the Source Editor feature of the Cloud Source Repositories: https://cloud.google.com/tools/cloud-repositories/docs/cloud...

Also, we're alpha testing some integration with the Source Editor and the Cloud Shell right now, so anyone that would like to participate in that alpha test can drop me a line: [email protected].

Chris Sells Cloud Developer Tooling Product Manager