Most efficient process for transferring ownership of all of a user's files using the Google Drive API

Question

I have written a Google Apps Script function that uses Domain-Wide Delegation of Authority (Oauth 2 service account), and the Google Drive API to transfer ownership of all G

Answer 1

Google just released a Data Transfer API that accomplishes most of this. It doesn't handle the parts that relate to User C, but it cuts out most of the steps that took the longest to run.