This is a reland of f61af569

gclient was updated to handle these refs on
https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1590495

Original change's description:
> bot_update: Pass target-ref to gclient.
>
> Bug: 956807
> Recipe-Nontrivial-Roll: infra
> Recipe-Nontrivial-Roll: skia
> Recipe-Nontrivial-Roll: build_limited_scripts_slave
> Recipe-Nontrivial-Roll: build
> Change-Id: I4d786d989446b8c1e3f39ef78c3c99cfe70808c0
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1588502
> Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
> Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>

Bug: 956807
Recipe-Nontrivial-Roll: infra
Recipe-Nontrivial-Roll: build_limited_scripts_slave
Recipe-Nontrivial-Roll: build
Change-Id: I06b2b517d3f1aeb0a12b7c5fc58f1621533dae5c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1592214
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>