Add chromium_trichrome_patcher as a releasetool

* releasetools are still python2, where it's hard to do this
* It was easier to pull this in standalone and build it as a python3
  binary and then run that directly rather than any other alternatives

Imported from: https://github.com/danielfullmer/robotnix/blob/master/modules/apps/chromium-trichrome-patcher.py
Per the README: "This project is available as open source under the terms of MIT license."

Change-Id: I156283ba1580f368f80ac242d05d0399936c3081