The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra/+/2523a294444b59e7b33870f216f051e893c1ada6

commit 2523a294444b59e7b33870f216f051e893c1ada6
Author: Shuotao Gao <stgao@chromium.org>
Date: Wed Apr 11 18:47:55 2018

[Findit] Use crrev to convert a commit position to git sha.

The original approach to achieve this is to go through getting the blamelist in a build that contain the commit position, and it is sub-optimal.

Bug:  831664 
Change-Id: Ib7a7329018bc62671e3c7969376c016179de5f93
Reviewed-on: https://chromium-review.googlesource.com/1007886
Commit-Queue: Shuotao Gao <stgao@chromium.org>
Reviewed-by: Brandon Wylie <wylieb@chromium.org>

[delete] https://crrev.com/22f62d09326c59d67fabb1fa1db0fdf30e575359/appengine/findit/services/flake_failure/test/commit_position_util_test.py
[delete] https://crrev.com/22f62d09326c59d67fabb1fa1db0fdf30e575359/appengine/findit/services/flake_failure/commit_position_util.py
[modify] https://crrev.com/2523a294444b59e7b33870f216f051e893c1ada6/appengine/findit/pipelines/flake_failure/analyze_flake_pipeline.py
[modify] https://crrev.com/2523a294444b59e7b33870f216f051e893c1ada6/appengine/findit/pipelines/flake_failure/test/analyze_flake_pipeline_test.py
[add] https://crrev.com/2523a294444b59e7b33870f216f051e893c1ada6/appengine/findit/infra_api_clients/crrev.py
[add] https://crrev.com/2523a294444b59e7b33870f216f051e893c1ada6/appengine/findit/infra_api_clients/test/crrev_test.py