The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra.git/+/a7d64276132bd6d1a210a4c375ed8b3b7e80d399

commit a7d64276132bd6d1a210a4c375ed8b3b7e80d399
Author: Chan Li <chanli@chromium.org>
Date: Fri Dec 02 21:09:50 2016

v# This will be displayed on the codereview site.
[Findit] Improve flake checker's algorithms.

1. Support cases when the flakiness is too new.
2. Bail out when all swarming tasks are stable continuously.

BUG= 665167 ,  665312 

Change-Id: Ic84c8888d6687cadbaf60871cd7ed803724985ee
Reviewed-on: https://chromium-review.googlesource.com/411453
Commit-Queue: Chan Li <chanli@chromium.org>
Reviewed-by: Shuotao Gao <stgao@chromium.org>

[modify] https://crrev.com/a7d64276132bd6d1a210a4c375ed8b3b7e80d399/appengine/findit/waterfall/flake/initialize_flake_pipeline.py
[modify] https://crrev.com/a7d64276132bd6d1a210a4c375ed8b3b7e80d399/appengine/findit/waterfall/flake/recursive_flake_pipeline.py
[modify] https://crrev.com/a7d64276132bd6d1a210a4c375ed8b3b7e80d399/appengine/findit/waterfall/flake/test/recursive_flake_pipeline_test.py