The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra/+/f2fa18e6660c47eb2a68cc0837532e2b7903a9e8

commit f2fa18e6660c47eb2a68cc0837532e2b7903a9e8
Author: Jeffrey Li <lijeffrey@google.com>
Date: Thu Dec 21 00:23:55 2017

[Findit] Flake Analyzer - Implement function to get nearest build

Bug:  794754 
Change-Id: Ie59443dfa225aa7a66d94205498c4c29e5ce0f5e
Reviewed-on: https://chromium-review.googlesource.com/826323
Commit-Queue: Jeffrey Li <lijeffrey@chromium.org>
Reviewed-by: Shuotao Gao <stgao@chromium.org>

[modify] https://crrev.com/f2fa18e6660c47eb2a68cc0837532e2b7903a9e8/appengine/findit/waterfall/flake/regression_range_analysis_pipeline.py
[modify] https://crrev.com/f2fa18e6660c47eb2a68cc0837532e2b7903a9e8/appengine/findit/waterfall/test/build_util_test.py
[modify] https://crrev.com/f2fa18e6660c47eb2a68cc0837532e2b7903a9e8/appengine/findit/pipelines/flake_failure/test/get_isolate_sha_pipeline_test.py
[modify] https://crrev.com/f2fa18e6660c47eb2a68cc0837532e2b7903a9e8/appengine/findit/pipelines/flake_failure/get_isolate_sha_pipeline.py
[modify] https://crrev.com/f2fa18e6660c47eb2a68cc0837532e2b7903a9e8/appengine/findit/waterfall/build_util.py
[modify] https://crrev.com/f2fa18e6660c47eb2a68cc0837532e2b7903a9e8/appengine/findit/waterfall/flake/test/regression_range_analysis_pipeline_test.py