The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/toolchain-utils/+/4f59a62546caa30051ac7c9a93c49069f7741245

commit 4f59a62546caa30051ac7c9a93c49069f7741245
Author: Ting-Yuan Huang <laszio@google.com>
Date: Thu Aug 17 00:46:17 2017

Switching from cbuildbot to cros tryjob

BUG= chromium:756100 
TEST=buildbot_test_toolchains.py, buildbot_test_llvm.py

Change-Id: Ie275b960afdb2ed7183a763302af70c3f2bc1092
Reviewed-on: https://chromium-review.googlesource.com/617404
Commit-Ready: Ting-Yuan Huang <laszio@chromium.org>
Tested-by: Ting-Yuan Huang <laszio@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>

[modify] https://crrev.com/4f59a62546caa30051ac7c9a93c49069f7741245/cros_utils/buildbot_utils.py
[modify] https://crrev.com/4f59a62546caa30051ac7c9a93c49069f7741245/buildbot_test_toolchains.py
[modify] https://crrev.com/4f59a62546caa30051ac7c9a93c49069f7741245/buildbot_test_llvm.py

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/toolchain-utils/+/0da40e061f617fbc13afa7986b386e0ed1e25810

commit 0da40e061f617fbc13afa7986b386e0ed1e25810
Author: Ting-Yuan Huang <laszio@chromium.org>
Date: Sat Aug 19 03:11:19 2017

Move cbuildbot flags to tryjob flags

They are now available and needn't to be pass through.

BUG= chromium:756100 
TEST=buildbot_test_toolchains.py

Change-Id: Icece6e74faa8966067346a3a5fc111c9fdb5e431
Reviewed-on: https://chromium-review.googlesource.com/622309
Commit-Ready: Ting-Yuan Huang <laszio@chromium.org>
Tested-by: Ting-Yuan Huang <laszio@chromium.org>
Reviewed-by: Don Garrett <dgarrett@chromium.org>

[modify] https://crrev.com/0da40e061f617fbc13afa7986b386e0ed1e25810/cros_utils/buildbot_utils.py
[modify] https://crrev.com/0da40e061f617fbc13afa7986b386e0ed1e25810/buildbot_test_toolchains.py