When uploading to either Rietveld or Gerrit, this will
cause git-cl to add the appropriate reviewers to the
cherry-pick review, so they're aware the change is being
copied to the release branch.

When uploading to Gerrit, this will also cause git-cl to
set the Code-Review+1 bit, allowing the CL to be landed

R=tandrii@chromium.org

Bug: 714720
Change-Id: Ie04e2657a91e4345796ac2200c0115fb18e460a1
Reviewed-on: https://chromium-review.googlesource.com/486961
Commit-Queue: Aaron Gable <agable@chromium.org>
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>