GitLab

To avoid having 2 tasks with same queue_time, each PushTask is preceded by
a FastForward().

Bug: 998477
Change-Id: Ibecca4edf6d4c53420c0584676356284681d4868
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1778925
Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692217}