To include change https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/2648266

Bug: 1030191
Change-Id: I6328efa2cc5acf42d0ec386f70f955fa77237260
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2659507Reviewed-by: Scott Lee <ddoman@chromium.org>
Commit-Queue: Chan Li <chanli@chromium.org>