The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra/+/a0183c99d741abef00acb83acccb3bb3189d63d9

commit a0183c99d741abef00acb83acccb3bb3189d63d9
Author: Shuotao Gao <stgao@chromium.org>
Date: Wed Apr 18 00:09:44 2018

[Findit] FlakeAnalyzer - Work around no build number for data points.

In the new flake analysis, all data points have no build number attached to it.
But it is impossible to retrieve a data point for the "suspected" build number.

Bug: 834100

Change-Id: I4ab88d656bf3a02af94e46211716dc277a07d313
Reviewed-on: https://chromium-review.googlesource.com/1016016
Reviewed-by: Chan Li <chanli@chromium.org>
Commit-Queue: Shuotao Gao <stgao@chromium.org>

[modify] https://crrev.com/a0183c99d741abef00acb83acccb3bb3189d63d9/appengine/findit/handlers/flake/check_flake.py

Jeff: is this still needed? Please confirm, and assign it back to me so that we could clean up the code in the handler.

data points should have build_number too for display purposes (even now though they're no longer used for display). This bug may be obsolete, as we don't rely on build number anymore.