"Publish Change Edit" is not a synchronized API call on Gerrit.
After the call, we need to explicitly check if the new patch exists
in Gerrit. Or, we may label +1 on an old patch.

BUG=1286212
TEST=train
Recipe-Nontrivial-Roll: chrome_release
Change-Id: I1443e2b4cf702f7cb4feebb43e34923f11383f35
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3384422Reviewed-by: Josip Sokcevic <sokcevic@google.com>
Commit-Queue: Xinan Lin <linxinan@chromium.org>