Make benchmark buildable and runnable outside tree am: d8071fb506 am: 3e00d58e60 am: ea3c341fa2 am: 156c78565a am: e44d0360ed

Original change: https://android-review.googlesource.com/c/platform/test/mlts/benchmark/+/1448577

Change-Id: Id081c7b6970f53e8f3b6d007db56e54f136a8f83