The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/autotest/+/21922c807733cab1a86096500304aa8ae68bd897

commit 21922c807733cab1a86096500304aa8ae68bd897
Author: Ningning Xia <nxia@chromium.org>
Date: Fri Jul 29 18:03:15 2016

Only offload CTS/GTS results for release builds.

Only offload results for release builds, not including pfq, paladin or
trybots builds.

BUG= chromium:632490 
TEST=unit_test;run_gs_offloader

Change-Id: I93107c773c242f0193447148a37f47491e5af651
Reviewed-on: https://chromium-review.googlesource.com/364720
Commit-Ready: Ningning Xia <nxia@chromium.org>
Tested-by: Ningning Xia <nxia@chromium.org>
Reviewed-by: Jason Kusuma <jkusuma@chromium.org>
Reviewed-by: Dan Shi <dshi@google.com>

[modify] https://crrev.com/21922c807733cab1a86096500304aa8ae68bd897/site_utils/gs_offloader_unittest.py
[modify] https://crrev.com/21922c807733cab1a86096500304aa8ae68bd897/site_utils/gs_offloader.py

Could we also do a suite filter for suite = 'arc-cts' only?
It seems that there are a few results from bvt-cq with suite = 'arc-bvt-cq' or suite = 'bvt-cq' that still ends up in the gs bucket e.g. 
gs://chromeos-cts-results/cheets_CTS.android.core.tests.libcore.package.harmony_java_math/73057362-chromeos-test_2016.08.12_16.01.09/testResult.xml.gz
gs://chromeos-cts-results/cheets_CTS.android.core.tests.libcore.package.harmony_java_math/73057258-chromeos-test_2016.08.12_15.58.32/testResult.xml.gz
gs://chromeos-cts-results/cheets_CTS.android.core.tests.libcore.package.harmony_java_math/73044245-chromeos-test_2016.08.12_06.33.54/testResult.xml.gz

moved comment #4 requirement to crbug/637498