Refactor of Main.newCopybaraTool()
Refactor of Main.newCopybaraTool()

This is needed for an internal extension of Main

PiperOrigin-RevId: 159603804
Change-Id: Iaa0d9b423b4d7e21fe755889cc3f713ff20dc43d

google/copybara,google/copybara,google/copybara