How do you enable the app-context-dependent touch bar for Photoshop on the new 2016 rmbp
You run Photoshop CC 2017 Version 18.0.1?
From the release note:
Use the Touch Bar with Photoshop - Photoshop now supports Touch Bar, the multitouch display at the top of the new MacBook Pro keyboard; Touch Bar support in Photoshop is currently a technology preview feature
Adobe said it is an experimental feature. It could be that this functions is not turned on automatically.
You can turn it on here: Preferences > Technology Previews > Enable Touch Bar