This commit changes the layout of recipe_engine a bit which breaks the
autoroller.

R=jchinlee@chromium.org, martiniss@chromium.org, tandrii@chromium.org

Bug: 913102
Change-Id: I207e6e5a13980e3819c2b4deb3c01c38c28ed876
Recipe-Manual-Change: infra
Recipe-Manual-Change: build
Recipe-Manual-Change: skia
Recipe-Manual-Change: skiabuildbot
Recipe-Manual-Change: build_limited_scripts_slave
Recipe-Manual-Change: release_scripts
Reviewed-on: https://chromium-review.googlesource.com/c/1368410
Commit-Queue: Robbie Iannucci <iannucci@chromium.org>
Auto-Submit: Robbie Iannucci <iannucci@chromium.org>
Reviewed-by: Stephen Martinis <martiniss@chromium.org>