cbuildbot: a workround for adding ts_mon_task_num to old branches.

BUG=chromium:740562
TEST=None

Change-Id: I3228856d0064dbf3bdfaf122d0d61f5ae0d18469
Reviewed-on: https://chromium-review.googlesource.com/565900
Commit-Queue: Xixuan Wu <xixuan@chromium.org>
Tested-by: Xixuan Wu <xixuan@chromium.org>
Reviewed-by: Xixuan Wu <xixuan@chromium.org>
1 file changed